Seventy-five percent of the surface of the earth （） by water. A: are covered B: is covered C: have been covered D: was covered

By the end of this month we _____ ten lessons. A: will cover B: covered C: will have covered D: have covered

Three fourths of the surface of the earth__________with water. A: is covered B: are covered

If all the continents and mountains were bulldozed fiat, the earth __ by water more than 12,000 feet deep. A: is covered B: would be covered C: could have been covered D: might had been covered

All the desks in the classroom________dust. A: are covered with B: are cover with C: are covering with D: covered with

She ___________ the table with a cloth. A: cover B: covers C: covered D: has covered

The ground is _______ with __________ leaves. A: covering; falling B: covered; falling C: covered; fallen D: covering; fallen

Thepathintheparklookedbeautiful,_____with_____leaves. A: covered;falling B: covering;falling C: covered;fallen D: covering;fallen

The mountains were covered

_______ of the earth is covered by water.