1 . “Solving ________ problem of plastic pollution is important. Landfill space is becoming limited,” says Wu, a Stanford University environmental engineering instructor. (用适当的词填空)

2 . Chinese hamburgers are very real and they predate ________ hamburgers we call our own in the U. S. (用适当的词填空)

3 . Our National Day is on ________ first day in ________ October.

A．a; the

B．the; a

C．the; /

D．a; /

4 . People speak highly of the boy’s bravery and calmness in ______ face of such an emergency. (用适当的词填空)

5 . Goals help students focus on their journey to a collection of achievements, meaning they make ________ most of their resources and time and can have motivation(动力)during times when they may feel like giving up. (用适当的词填空)

6 . But after assessing ______ number of extant pandas in the late 1970s, China came to realize the fact that the animals had become a rare and endangered species. (用适当的词填空)

7 . Much to our delight，the sound of water in ________ distance caught our attention and drove us to the river bank. (用适当的词填空)

8 . This is ________ story of friendship. Let’s read ________ story together.

A．a; an

B．an; the

C．an; a

D．a; the

9 . Even the most beautiful dress or the coolest toy car can never take____place of a great book as a gift for children. (用适当的词填空)

10 . McGregor must stay in bed for a month on __________ basis of the medical reports his doctor has received. (用适当的词填空)