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Geography is a very interesting subject; _______ very few people study it thoroughly.

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 It’s a shame that you have _______ time in New York on the tour.

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When_____ in international trade, letters of credit are convenient.

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I think he is unwell; he was complaining_______ a headache this morning.

Robots ___________  an important role in our life.

Don’t forget to _____ all the lights when you go to bed.

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Mathematics_____ very interesting to me.

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You ___________ me, because I didn’t say that.

Choose the word (a, b, c, or d) that best fits each of the blank spaces. 
Computers are very (21)____, but they also can (22) _____ problems. One kind of problem is with the computer’s memory. It is not perfect, so (23) ____ computers lose (24)______information. Another problem is with the machinery. Computers are machines, and (25)_____can break down. When computers break down, they may erase information, like chalk on a blackboard. Or they may stop doing anything at all. And there is another different kind of problem with computers. Some doctors say they may be bad for your (26)_____. 

(23).......... 

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After Jessica_____ her agree, she intends to work in her father’s company.

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The line is busy; someone______ the telephone now.

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We _____ put the fish in the fridge before it spoils.

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“What is your opinion of the Smiths?”.

          “They are_____ people”.

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There was a big hole in the rod which _______ the traffic.

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It is necessary that he_____ a certificate in English?

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A small stone struck the windshield while we _____ down the gravel road.

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_____ you help me with the homework?

Choose correct answer A, B, C or D to complete the sentence.  They'd rather_____ in the field than stay at home

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Photocopiers are used_______ of a written text.

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_____by the visitor, the clavichord could not be used.

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Mathematics courses _____ generally required in American high schools.