一、单句语法填空
1.When I opened the door,I found the fallen leaves (cover) the ground.
答案:covering
2.I heard her (sing) an English song when I passed by her room.
答案:singing
3.She noticed the classroom (clean) by the monitor when she came in.
答案:being cleaned
4.I’m very sorry to keep you (wait).
答案:waiting
5.With an old man (lead) the way,we had no difficulty finding the village.
答案:leading
6.It’s wrong to leave the water (run).
答案:running
