If the tree hadn't been so high, he _____ it up to take his kite down.
A.climbed
B.is climbing
C.climb
D.could have climbed

If the wall weren't so high, he _____ it up to take his ball down.
A.could climb
B.climb
C.climbed
D.is climbing

If I _____ her phone number, I _____ her last night.
A.knew/ could phone
B.know/ can phone
C.had known/ could have phoned
D.knew/ would have phoned

____, please paint the windows before you leave.
A.Unless you can have enough time
B.If you have enough time
C.Unless you have enough time
D.If you’ll have enough time

_____________, he would accompany you on the piano.
A.because he were here
B.were he here
C.Supposing he were here
D.Both A and C

She said if she _____ that the traffic lights were red she _____.
A.realized/ could have stopped
B.had realized/ would have stopped
C.had realized/ would stop
D.has realized/ stopped

There are only a small number of Siberian tigers in the wild.
A.nature
B.life
C.extinction
D.Earth

Choose the correct answers to complete the following sentences.I would have visited you before if there _____ quite a lot of people in your house.
A.hadn't
B.hadn't been
C.wouldn't be
D.wasn't

If you had caught the bus, you _____ late for work.
A.wouldn't have been
B.would have been
C.wouldn’t be
D.would be

If I _____, I would express my feelings.
A.asked
B.
C.would ask
D.