that all the risks should be calculated in advance. A: This is necessary B: Which is necessary C: That is necessary D: It is necessary

We consider _____ lessons should be previewed before the class. A: that it necessary B: it that necessary C: it necessary that D: necessary it that

I find ____________ to make some changes. A: it is quite necessary B: that is quite necessary C: it quite necessary D: quite necessary

Complete the following sentences with the words given in brackets. Make changes when necessary.The drug ___________(traffic) help to fuel corruption in the country.

If_____, we’ll continue our experiment after office hours. A: being necessary B: be necessary C: is necessary D: necessary

If_____,<br/>we’ll continue our experiment after office hours. A: being necessary B: be necessary C: is necessary D: necessary

We consider ____university students should do more reading during their spare time. A: necessary that B: necessary C: it necessary D: it necessary that

Fill in the blanks with the proper words or expressions given below, changing the form if necessary.The time for people to think more about showing thanks is ________.

Fill in the blanks with words given in the bracket, changing the form if necessary.The little boy was so­­____2____ (absorb) in a picture book that he did not hear the bell.

在学校克服害羞是必要的。 A: It is necessary to treat shyness at school. It is necessary to wipe out shyness at school. B: It is necessary to overcome shyness at school. C: It is necessary to deal shyness at school.