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I know it isn't easy facing off against the lowlifes of this town, but you're on the police force and you have to _____________ your duty

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Analysts suggested the country ____ its infrastructure to get foreign investment

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My mum was absolutely overjoyed to finally be _______ her promotion

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Water is of vital importance to all living things. Without it, all living things will surely die. We also use a great (16)______ of water daily in our homes, in factories, and in power stations. Most of this water is fresh water and it comes to us from reservoirs, rivers and lakes. The Earth's surface is (17)_____ by large areas of water which we call oceans and seas. If you have tasted the water from the sea, you will know that, unlike fresh water, seawater tastes salty. This is due to the (18)_____ of sodium chloride which comes from the land. Rivers carry it to the sea. Although neither salt nor fresh water has any color, the sea often looks blue (19)______ the sunlight. The reason is that sunlight is made up of many colors. Some colors disappear quickly in the sea but blue light bounces back or is reflected, to the surface. This makes the sea look blue. (20)______ , a stormy sky will make the sea look grey

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People of different countries have quite different life styles. We American are wasteful people, (25) _______ saving. Our grandfathers began this pattern, for nature’s resources seemed so plentiful that no one ever imagined a shortage. Within a few years of the first Virginia settlement, for example, pioneers burned down their houses when they were ready to move to west. They only wanted to have the nails for (26) _______ use. No one ever gave a thought to the priceless hardwoods that went up in smoke. We the people in the United States destroy many things that other peoples save. I (27) _______ this when I was living in Britain. I received a letter from one of England’s largest banks. It was enclosed in a used envelop that had been readdressed to me. Such a practice would be (28) _______ in the United States. American banks, (29) _______ the smallest, always use expensive stationery with the names of all twenty-eight vice-presidents listed on one side of the page

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Under no circumstances, ………or exchanged.

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One of my distant relatives is wavering between buying a house in the inner city or moving away

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Please don’t ring the doorbell when you get here. My baby ______. .

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There are a great number of things that he can easily do ......

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Don’t forget to bring a ________. It will keep you warm when you sleep at the campsite

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_______ you see Frank at the conference, give him my regards

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Jo will help us ________ some of the homework

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Could you pass me ______________, please?

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_______ you drink clean water, the healthier you become

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Several governments now encourage young people to take part in dating events

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____ will lead to the extinction of rare animals due to the loss of their habitats, and extreme floods and land erosion

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Although the conditions weren’t ideal for a walk, we decided to  ........  a go of it

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We ___________ some improvements to the house before selling it

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They said they'd do me ...........  if I refused to drive the getaway car

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It took Juan a long time to build up the courage to ..... Mariella ....., but at last he did and she said yes

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When Tet holiday comes, Vietnamese people often feel inclined to _______ their houses