一、用 if 或 unless 填空。
1. You will not improve your skill in a short time ______ you practise playing the violin regularly.
2. ______ you don't work hard, you will fail the exam.
3. Tom can't be here on time ______ he gets up early.
4. ______ you don't have enough sleep, you will feel tired.
5. ______ you finish your homework, you will not go out to play.

unless
; If
; unless
; If
; Unless

二、根据句子意思,用括号中所给单词或短语的正确形式填空。
1. If Amy takes part in the game show, she ______ (win) a prize.
2. Unless you try your best, you ______ (not realize) your dream.
3. Everybody ______ (be) sad if we don't win the football match.
4. If you ______ (not keep) the meat in the fridge, it will go bad.
5. Unless I ______ (invite), I won't go to the party.
6. (2023·江苏无锡)If this ______ (go) on, the wild animals will soon have nowhere to live.

will win
; won't realize
; will be
; don't keep
; am invited
; goes

三、单项选择。

( )1. (2023·湖南岳阳改编)You won't pass the PE exam successfully ______ you exercise every day.
A. if
B. unless
C. as long as
D. since

B

( )2. (2023·安徽)Our country will be much better for everyone in future ______ we all do something to help now.
A. if
B. before
C. so that
D. even though

A

( )3.(2023·黑龙江绥化改编)I don't know if it ______ sunny tomorrow. If it ______ sunny, I will go fishing.
A. will be; is
B. is; will be
C. will be; is going to be
D. will be; will be

A