10.　 They will climb the hills if it _____________ (rain) tomorrow .

9.　　 Spring is the best season __________________ (plant) trees .

8.　　 Can you finish ___________ (paint) a house in 10 minutes ?

7.　　 They have decided _______________ (build) another bridge over the river .

6.　　 Look at the picture. It _________________ (look) very nice .

5.　　 Oh, dear ! I ____________ (lose) my key and now I can’t enter my room.

4.　　 Lucy is not here at the school , she __________ (go) to London for her holidays .

3.　　 Tell me what _____________ (happen) during your stay in Shanghai .

2.　　 The doctor was walking in the street when he ______________ (meet) a friend of his .

1.　　 We all know that light ______________ (travel) much faster than sound .