What’s wrong with you , Eric ? You look tired .–I ______ to prepare for the final exam last night .

A lot of scientists believe that women’s sense of smell is better developed than ____ of men.

.．It was announced that only when the fire was under control_________to return to their homes．

Could I have some snacks between meals, mum?—No, you __________.

Which is ______, the sun, the moon or the earth? —Of course the sun is.