51.
Read the sentence mentioned below. Check the tense of the verb. Correct the verb if it is incorrect.

Water boils at 100 degrees celsius.

56.
In recent decades, the efficiency of the United Nations . . . . . . . . by a growing number of countries.

57.
Kate . . . . . . . . a vegetarian for eleven years now, and she . . . . . . . . meat at all during this time.

60.
The athletes . . . . . . . . for exactly three months by the time the races . . . . . . . . due to start.

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