一、用 if 或 unless 填空。
1. You will not improve your skill in a short time
unless
you practise playing the violin regularly.
2.
If
you don't work hard, you will fail the exam.
3. Tom can't be here on time
unless
he gets up early.
4.
If
you don't have enough sleep, you will feel tired.
5.
Unless
you finish your homework, you can't go out to play.
答案：1. unless 2. If 3. unless 4. If 5. Unless
二、用括号中所给单词或短语的适当形式填空。
1. If Amy takes part in the game show, she
will win
(win) a prize.
2. Unless you try your best, you
won't realize
(not realize) your dream.
3. Everybody
will be
(be) sad if we don't win the football match.
4. If you
don't keep
(not keep) the meat in the fridge, it will go bad.
5. Unless I
am invited
(invite), I won't go to the party.
6. If this
goes
(go) on, the wild animals will soon have nowhere to live.
答案：1. will win 2. won't realize 3. will be 4. don't keep 5. am invited 6. goes
(
C
)1.(2025·江苏淮安一模)Many people believe we will face serious problems
unless
we take action to change the way we live.
A.but
B.though
C.unless
D.until
答案：1. C 【点拨】句意:许多人认为我们将面对严重的问题,除非我们采取行动来改变我们的生活方式。unless 除非。故选 C。
(
A
)2.(2025·江苏无锡新吴区二模)—Can I have another ice cream?
—Jack, you may have a toothache
if
you eat too much sweet food.
A.if
B.though
C.unless
D.until
答案：2. A 【点拨】结合语境可知,此处应用 if 引导条件状语从句。故选 A。
(
B
)3.(2025·江苏徐州一模)More than 40% of the insects around us may die out in the future
unless
we change our ways of producing food.
A.if
B.unless
C.until
D.when
答案：3. B 【点拨】根据语境可知,用 unless 引导条件状语从句。故选 B。
(
A
)4. —You are not supposed to enter the teachers' office
unless you are allowed to
. —Thanks, Mum. I got it.
A.unless you are allowed to
B.if you want to ask questions
C.when you are asked to come in
D.where you are going
答案：4. A 【点拨】A 项意为“除非你被允许”,符合语境。故选 A。
(
B
)5.(2026·江苏无锡期末)—Jenny, you've learnt a lot from making Huishan clay figures.
—I can't make a complete one
unless
I put all my effort into it.
A.if
B.unless
C.since
D.as
答案：5. B 【点拨】前后句之间是条件关系,且后句是前句的必要条件,即“只有全力以赴才能完成”,应用 unless。故选 B。
(
C
)6.(2026·江苏镇江丹阳期末)You can't imagine how magical Zhengze Embroidery(刺绣) is
unless
you see a piece of work with your own eyes.
A.if
B.after
C.unless
D.though
答案：6. C 【点拨】根据语境可知,应用 unless 引导条件状语从句。故选 C。
(
B
) 7.
Unless
you interview the prize winners, you can't write a good report on their competition.
A.Because
B.Unless
C.If
D.While
答案：7. B 【点拨】根据前后两句的关系可知,前一句是后一句的否定条件,不采访获奖者,就写不出好报告。故选 B。
