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7. Use much, many.

1. How ... bulbs are there on that bench, Paul? 2. We don't need ... sulphuric acid. 3. Is there ... water in the vessel? 4. There isn't ... meat at home, and there isn't ... fish either. 5. Do you really need so ... distilled water? 6. He says he couldn't bring ... samples. 7. Have you got ... money? 8. There is ... carbon oxide in the city air. 9. ... people came to his lecture. 10. … of what he says is tested experimentally. 11. I've got ... time. 12. How ... is there in this tube?

8. Use (a) few, (a) little.

1. There is ... solvent in the container. 2. Is there so ... salt left? 3. Tom has made very … mistakes in the test. 4. There are ... samples of suspension left. 5. There is ... suspension left. 6. Ann has ... English books, she wants to buy some more. 7. Give me … time. 8. I know …about colloids. 9. There are very … reagents suitable for this experiment. 10. There were … devices at our disposal last week.

Study the following chart, mind the meaning of modal verbs and their equivalents:

The students must study hard.

duty, obligation

The meeting is to take place at 5 p. m.

plan, agreement

We can finish our work in time.

They couldn’t complete the synthesis yesterday.

We shall be able to solve this prob­lem much earlier if we get neces­sary information in time

ability, capability

May I take this book?

You may take this book, I have already read it.

request, permission

9. Complete the following sentences according to the models.

Model I: I have missed many lessons and now I…very hard.

I have missed many lessons and now I have to work very hard.

The results of their experiments were bad, they … them.

The results of their experiments were bad, they had to repeat them.

1. He has worked very hard this month, he ... a little now. 2. This substance is very rare, if you want to use it you ... before the experiment. 3.  They used analytical balances as they ... very minute quantities. 4. The water is very cold, you ... before drinking it.

Model II: I cannot attend the meeting as I … at home at six.

I cannot attend the meeting as I am to be at home at six.

1. Don’t be late, the meeting ... at five sharp. 2. He ... his research work by the end of this year, that’s why he is so busy. 3. The temperature ... 100 C0 if you want to complete your experiment in time. 4. Don’t you know that you ... at three today.

10. Fill in the blanks with modals:

1. I ... help you yesterday as I came very late from the Institute. 2. You . . . understand now that it is necessary to do everything in time. 3. ... I take your dictionary? I have lost mine. 4. Today he ... come to the library as he has a meeting. 5. They ... prepare everything for the experiment tonight. 6. If you want, you . . . read this article.

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