根据汉语意思完成下列句子。

1.离开房间时,关灯是很容易做到的.

    ___ quite easy___ _______ ______ the lights when you leave a room.

2.学生们空闲时间通常玩电脑游戏.

The students usually____ computer games ___ ____ ____ ____.

3.每只海牛平均大约有10英尺长,重约1000磅.

The average manatee is about____  ___   ____ and it _______about 1,000____．

4.他已经参观过他祖先居住的地方了吗?

_________ he____ the 'place where his ancestors lived________?

5.当你刷牙时,不要让水龙头一直流水,要节约用水.

Don't leave the tap ____while you brush your teeth. We must__________  ___________．