D.nor

E.and

F.for

正确答案：nor

5、Choose a coordinating conjunction to combine each pair of simple sentences.选择合适的并列连词连接每一题中的两句。Important cultural documents， not all pictures can be saved.Not all pictures should be saveD.

A.or

B.so

C.but

D.nor

E.and

F.for

正确答案：and

6、Choose a coordinating conjunction to combine each pair of simple sentences.选择合适的并列连词连接每一题中的两句。The Human Genome Project will take longer to accomplish than the Apollo program landing a man on the moon.It will not be completed in a few decades.

A.or

B.so

C.but

D.nor

E.and

F.for

正确答案：for

7、Choose a subordinating conjunction to combine each pair of simple sentences.选择合适的连词连接每一题中的两个句子。Computers work accurately and at high speeds.They save research workers years of hard work.

A.when

B.unless

C.because

D.as

E.although

F.if

G.that

正确答案：because

8、Choose a subordinating conjunction to combine each pair of simple sentences.选择合适的连词连接每一题中的两个句子。I want to build my business through my people.I have to build their own belief in their capacity to achieve.

A.when

B.unless

C.because

D.as

E.although

F.if

G.that

正确答案：that

9、Choose a subordinating conjunction to combine each pair of simple sentences.选择合适的连词连接每一题中的两个句子。Sleep patterns change during teenage.Any parent of a teenager can prove.

A.when

B.unless

C.because

D.as

E.although

F.if

G.that

正确答案：as

10、Choose a subordinating conjunction to combine each pair of simple sentences.选择合适的连词连接每一题中的两个句子。The number of school bus casualty is not large.The safety of children is always of intense public concern.

A.when

B.unless

C.because

D.as

E.although

F.if

G.that

正确答案：although

11、Choose a subordinating conjunction to combine each pair of simple sentences.选择合适的连词连接每一题中的两个句子。Children overcome challenges on their own.They develop new skills and a strong belief in their abilities.

A.when

B.unless

C.because

D.as

E.although

F.if

G.that

正确答案：when

12、Choose a subordinating conjunction to combine each pair of simple sentences.选择合适的连词连接每一题中的两个句子。A child’s daydreaming is hindering him/her from progressing in school or from gaining social skills.