1 . Most of the earth’s surface is ________ by water so we call it Blue Planet.

2 . Most of the earth’s surface is c________ (覆盖) by water.

3 . 那些山全年被树木覆盖。
Those mountains are ________ ________ trees all year around.

4 . 昨晚下了大雪，地面被雪覆盖着。
It snowed hard last night. The ground is ______ snow.

5 . 大约地球的百分之70被水覆盖。
About 70% of the Earth _______________________________ water.

6 . 天灯被纸覆盖。（cover）
The sky lantern ________ paper.

7 . What a dirty room it is! The desks and chairs are all covered ________ dust (灰尘). We should clean it at once!

A．for

B．by

C．with

D．of

8 . Everything was ________ (cover) by snow and ice.

9 . 那边的山上覆盖着白雪。
The mountains over there ________ ________ ________ snow.

10 . The square is covered ________ colourful flowers.