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The phone was engaged when I called. Who ____ to?

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Many groups worldwide are trying to develop vaccines that protect against a wide range of coronaviruses and prevent (26) _______ pandemic. These efforts have now been boosted by the discovery that some healthcare workers had pre-existing immunity to the SARS-CoV-2 virus during the first wave of the pandemic. During the first half of 2020, around 700 healthcare workers in the UK were tested weekly as part of a crowdfunded study called Covid Sortium. Most of these people, who wore protective equipment, never tested positive for covid-19 in PCR tests or developed covid-19 antibodies – proteins that (27) _______ to the outside of viruses, preventing cells from being infected. (28)_______ , when Leo Swadling and Mala Maini at University College London and their colleagues looked more closely, they found some of those (29) _______ tested negative had a protein in their blood that is linked to covid-19 infection, as well as T cell responses to the SARS-CoV-2 virus. T cells are (30) _______ of the immune system

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Hellen started a course at college, but she ____ after a few weeks.

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The soldiers ........ the villagers and seized all their weapons

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More emphasis should be placed on _________ alternative sources such as wind, solar energy, and tides

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It is back-to-school time in much of the worlD. Calm, easy mornings are replaced with busy, hurried ones. Children wake up early and get ready for school. Many parents are also getting ready for work, helping their children and preparing food for lunches. But don't forget about breakfast! When things get wildly busy in the morning, some people (32)_____breakfast to save time. But that may be a big mistake for students. That is the finding of a 2015 study from Cardiff University in Wales. Researchers there looked at 5000 9-11 year-olds from more than 100 primary schools in the U.K. They looked at what the students ate (33) _____ breakfast and then their grades 6 to 18 months later. They found that the students who ate a healthy breakfast (34) _____twice as likely to perform above average in educational activities. The researchers also found that unhealthy breakfasts - such as potato chips or a donut did not appear helpful to educational performance. A good breakfast is not just helpful for school-aged children. We all may gain from eating something healthy first thing in the morning. A study from researchers at the University of Toronto in Canada found that a breakfast rich in protein and complex carbohydrates (35) _____ performance on short- and long-term memory. Carbohydrates and protein are especially important because (36_____a major effect on long-term memory

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Human beings can clash very easily, ____ is why it's hard for some people to maintain many friendships.

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Only after food has been dried or canned __________

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She was so ____ in her job that she didn't hear anybody knocking at the door

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I ....... your car with great care, and I fixed a lot of little things

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I never wear red. It’s color that doesn’t _________me

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The phone bill is enormous. You ____ your boyfriend in Australia, ____?

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When do you .... for Easter?

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There is nothing I care ___________ more than my children

Choose the letter A, B, C or D to complete the sentence: “What is your ………?” “I am Ly.”

How much rice............... you want? - Two kilos.

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Students who complete the program receive a skills ____ along with their high school diploma

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She had never intended to _____________ wrong and he had punished her too hard!

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I shall do the job to the best of my______

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She has looked ____ to my father for her whole life. He's a wonderful example of a kind-hearted person with good judgement.

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More wildlife ____ need to be built to save animals from extinction