Three-fourths of the surface of the earth＿＿＿sea．

The class ______ big. Now the class_______ practicing swimming.

It is said that the number of doctors invited to the meeting _____100, but a number of them _____ absent for different reasons.

Such poets as Shakespeare _____ widely read, of whose works, however, some _____ difficult to understand.

Each of the students in our class　　　　great interest in English and we each　　　　a copy of A New English­Chinese Dictionary.