About_____ of the earth__ __covered with water, but we have less and less available fresh water.

I ___________ frustrated when I wasn’t sure of thecorrect answer.

All the building materials have been washed away.—-So I have heard. But there was no sign ____ a heavy rain was on the way last night.

Three months ________ since we met last time.

Experts say ________ to sunlight for too muchtime will do harm to one’s skin