(
—I like it it calms my mind and helps me study better.
A.for
B.because
C.but
D.so
B
)1. —Why do you love listening to classical music so much?—I like it it calms my mind and helps me study better.
A.for
B.because
C.but
D.so
答案：1. B 【点拨】用 why 提问，必须用 because 回答直接原因；for 不能回答 why。故选 B。
(
A.because
B.while
C.for
D.unless
C
)2. Soft dance music makes people feel relaxed, it has a slow and smooth beat.A.because
B.while
C.for
D.unless
答案：2. C 【点拨】逗号后补充说明放松的理由，属于附加解释，用 for。故选 C。
(
— I was busy practising playing the violin for the music test.
A.Because
B.For
C.So
D.Though
A
)3. —Why didn't you take part in the art show last week?— I was busy practising playing the violin for the music test.
A.Because
B.For
C.So
D.Though
答案：3. A 【点拨】原因放在句首，只能用 because；for 不能置于句首。故选 A。
(
A.because
B.so
C.but
D.for
D
)4. This pop song is very popular with students, its lyrics are warm and easy to sing.A.because
B.so
C.but
D.for
答案：4. D 【点拨】前半句陈述事实，后半句补充理由，有逗号分隔，用 for。故选 D。
(
—I keep practising I want to make my art skills better and better.
A.for
B.because
C.if
D.until
B
)5. —Why do you keep drawing every day after school?—I keep practising I want to make my art skills better and better.
A.for
B.because
C.if
D.until
答案：5. B 【点拨】直接回答 why 的提问，表明确的原因，用 because。故选 B。
(
A.because
B.when
C.where
D.for
D
)6. Watching paper-cutting shows is very interesting, every piece is full of special culture.A.because
B.when
C.where
D.for
答案：6. D 【点拨】补充说明有趣的理由，句中逗号后属于附加解释，用 for。故选 D。
(
—I like it I can use different colours to show my ideas freely in class.
A.because
B.for
C.so
D.but
A
)7. —Why do you show great interest in the Art class every week?—I like it I can use different colours to show my ideas freely in class.
A.because
B.for
C.so
D.but
答案：7. A 【点拨】问句以 Why 提问，必须用 because 回答直接原因。故选 A。
(
—I think it must be very valuable, every line and colour is full of strong artistic feelings.
A.because
B.for
C.though
D.if
since 和 as 引导的原因状语从句
B
)8. —This ink wash painting is so lively and beautiful.—I think it must be very valuable, every line and colour is full of strong artistic feelings.
A.because
B.for
C.though
D.if
since 和 as 引导的原因状语从句
答案：8. B 【点拨】后半句是对画作价值的推测性补充理由，并非直接因果，用 for。故选 B。
(
—Sure! you are my best friend, I will spare time to help you.
A.Because
B.Since
C.But
D.So
B
)1. —Could you help me practise playing the violin after school?—Sure! you are my best friend, I will spare time to help you.
A.Because
B.Since
C.But
D.So
答案：1. B 【点拨】侧重双方已知的原因，用 since(既然)。故选 B。
(
A.As
B.So
C.Or
D.Though
A
)2. the art room is quiet and comfortable, many students like drawing and painting there.A.As
B.So
C.Or
D.Though
答案：2. A 【点拨】显而易见的环境原因，用 as(由于)。故选 A。
(
A.As
B.Since
C.But
D.And
B
)3. everyone loves music, our class decides to hold a small singing party this Friday.A.As
B.Since
C.But
D.And
答案：3. B 【点拨】全班已知的共识原因，用 since。故选 B。