31.
By the time we . . . . . . . . our preparations for the congress, most of the participants. . . . . . . . at the hall.

32.
Complete the following conversation using the appropriate option:
A:What would you like to eat?
B: ____________ a sandwich, please. (I/have)

33.
One feels that there . . . . . . . . any noticeable improvement in the human rights problem in Africa until all the African countries . . . . . . . . their economic difficulties.

34.
Fill in the blank with the most appropriate word.
People go to the tomb of the Unknown Soldier to stand in silence for a minute to honor the memory of those who ____ in wars.

35.
No zoologist . . . . . . . . able to keep a gorilla under close observation in the dark jungles in which he . . . . . . . ..

36.
Choose the most suitable option to fill in the blank:
We must do something soon before it ______(be) too late.

37.
What I . . . . . . . . is that we . . . . . . . . to think seriously about a thorough reform in the legal system.

38.
You should . . . . . . . . exercise daily.

39.
Fill in the blank with the most appropriate word:
They ______ to London in 1995.

40.
He has been . . . . . . . . the plants for two hours.

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