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1.______ he works hard, I don’t mind when he finishes the experiment.(4·Ö)

2.Why does he look sad?
There are so many problems ________.
(4·Ö)

3.The houses _____ for the teachers and the construction work will start soon.(4·Ö)

4.However, at times this balance in nature is _______, resulting in a number of
possibly unforeseen effects.
(4·Ö)

5._______ conventional black ink costs newspaper about thirty cents, most rub-resistant inks add at least ten cents more to the bill.(4·Ö)

6.Had he worked harder, he _______ the exams.(4·Ö)

7.This box is too heavy, ______ give me a hand?(4·Ö)

8.In addition to rice, we need to _______ our diet with fish, meat and vegetable.(4·Ö)

9.The course normally attracts 20 students per year, _______ up to half will be from overseas.(4·Ö)

10.The Chinese women volleyball players ________________ both in and out of China.(4·Ö)

11.The speech which he made _________ the project has bothered me greatly.(4·Ö)

12._______ one time, Manchester was the home of the most productive cotton mills in the world.(4·Ö)

13.A lorry _______ Jane’s cat and sped away.(4·Ö)

14.The book _____ he devoted much time is to come out next month.(4·Ö)

15."You are very selfish. It’s high time you ______ that you are not the most important person in the world," Edgar said to his boss angrily.(4·Ö)

16.Since this road is wet and slippery this morning, it _______ last night.(4·Ö)

17.Everything depends on ________ we have enough time.(4·Ö)

18.__________ his examination of the patient, the doctor wrote out a prescription.(4·Ö)

19.I’d rather you _______ make any comment on the issue for the time being.(4·Ö)

20._______ evidence that languageª²acquiring ability must be stimulated.(4·Ö)

21.I have heard both teachers and students _______ well of him.(4·Ö)

22.Our journey was slow because the train stopped ______ at different villages.(4·Ö)

23.I’m sure he is up to the job ______ he would give his mind to it.(4·Ö)

24.The physics exam is not difficult, is it?
________. Even Harry _____ to the top students failed in it.
(4·Ö)

25.When he realized the police had spotted him, the man ______ the exit as quickly as possible.(4·Ö)