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He dropped out __________ school a month before graduation

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I think her backache was just a way of.........  the housework

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Mr. Brown ………………..  English

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In order to increase productivity, we need to significantly improve our ------- of production

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When experiencing technical difficulties, it is ------- to consult with a trained expert.

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The warming of the Pacific Ocean has created weather patterns (31)__________ strongly affect the world. When the water is warm, the (32)__________ of rainfall in Indonesia and the surrounding regions decreases. Australia could even experience a drought in many parts. On the other hand, Chile (which borders the Pacific Ocean) is preparing for severe rainstorms. In Pakistan and northwestern India, the weather pattern makes the rainy season weaker and makes the area much drier. This happening is called El Nino and is used by weather forecasters to make long-range weather predictions. They also know that El Nino will (33)__________ unusually heavy rains to the southwestern part of the United States and make the central part of the country drier at the same time. According to research, weather forecasters (used to know about the coming weather with certainty. Now everything has become (34)__________ different. El Nino itself used to be (35)__________ . It would occur every two to seven years. But now, this weather pattern is becoming more frequent. We cannot say when and how often tornadoes or cyclones occur. Scientists are unsure of the reason for this change on a global scale either

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You’ve been punished of bad marks, _________?

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We look __________ the neighbors' cat while they're away

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Be sure to put __________ your campfire before you go to sleep

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Ernest Hemingway is ............. of modern fiction. 

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He’s still sleeping, ________

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Since he is often ignored by his colleagues, he ____ has the opportunity to demonstrate his ability

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 ____ of his job as a forester is to take care of these trees.

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I ____ near the fence when suddenly I ____ the voices.

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If we _____ wasting water, there will be a shortage of freshwater in a few decades

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Scientists are looking for ways to cut ____ the cost of renewable energy sources.

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The executives of Walt & Warren have finally reached a ------- regarding the merger with Grainger Enterprises

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When summer comes and the sun appears, it’s good to have a hat. Many people have traditionally (30) _____ for the panama hat. Stylish, light and cool on the head, these palm leaf hats are (31) _____ enough to roll up and put in a pocket or bag. Nowadays panamas can be found in fashionable shops all over the world, sometimes at exorbitant price. However, the hat itself originated in rather humble surroundings in the jungles of South America. In a long tradition (32) _____ was haned down from generation to generation, the palm leaves are gathered by the men and the hats are woven by the women. It can take up to 12 palm leaves to make a top quality hat. Each leaf is split up to 25 times to obtain a straw that is fine enough to be woven into a hat. The women’s job is dictated by the weather and visibility: there must be enough light for them to see the fine straw, but the air must be moist enough for it to (33) _____ flexible. This means that the women can usually only work in the early morning. (34) _____ panama hats are expensive, back in the villages the craftsmen and women are struggling to keep the tradition alive and often receive only a fraction of the price you pay in the shops

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It's getting dark, so we'd better make __________ camp

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It was customary then for children to stand __________ when the teacher came into the classroom

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Mr. Chen is more _____ because he has finally agreed to allow his daughter to join an overseas volunteer organisation in Africa