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Although the chemist’s initial experiment failed, she stumbled upon a strong new material in the process

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We would like to remind all our guests __________ their keys at reception before they depart

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Once you get all of your sewing supplies .........  , I'll come help you

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If the program ........ on complicated drawings, it is of no use to us professionally.

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Of all high school courses, mathematics _____ to be difficult

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We _______ for going home when it began to rain

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After a busy day of work and play, the body needs to rest. Sleep is necessary for good health. During this time, the body recovers from the (26) ______ of the previous day. The rest that you get while sleeping enables your body to prepare itself for the next day. There are four levels of sleep, each being a little (27) ______ than the one before. As you sleep, your muscles relax little by little. Your heart beats more slowly, and your brain slows down. After you (28) _____ the fourth level, your body shifts back and forth from one level of sleep to the other. Although your mind slows down, you will dream from time to time. Scientists who study sleep state that when dreaming (29) ______ , your eyeballs begin to move more quickly. This stage of sleep is called REM, which stands for Rapid Eye Movement. If you have trouble falling asleep, some people recommend breathing very slowly and deeply. Other people believe that drinking warm milk will make you (30) ______. There is also an old suggestion that counting sheep will put you to sleep

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We might have failed if you______us a helping hand

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Only after food has been dried or canned __________

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When you go ..........  , I'll be left high and dry

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Laboratory tests carried ________ by three independent teams of experts have given similar results

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Unfortunately, the president has taken the ________________ that the national parks around the country are not worth protecting and maintaining

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Children _________play football in the street. They _________ play it in the stadium

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Anna tried to ...... , but he held her tight

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If he ____ this homework to do, he would have gone out with his friends.

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The plane had moved onto the runway and the cabin crew were standing _______ take-off

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As a ------- of the recent reorganization of the company, the management anticipates an improvement in operating income

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The milk in the fridge smell awful; don't drink it

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- When will Mary be able to leave hospital?
- Don't be so impatient. We cannot release her before we ____ the last test

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A: "Each of us should join hand to protect the World Heritage Sites." - B: “____"

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The authority _______ down that building to build a supermarket