1 . Heat e______ metals while low temperature contracts them. (根据首字母单词拼写)

2 . Self-driving is an area _________China and the rest of the world are on the same starting line.(用适当的词填空)

3 . The orphan came from Henan Province, ________ is far from here.

A．which

B．that

C．where

D．in which

4 . The reason ________ he was late for school was that he had knocked down by a bike.

A．why

B．where

C．when

D．that

5 . We were about to go out for a walk________it began to rain. (用适当的词填空)

6 . They are sisters but they d____________ (不同) from each other in many ways. (根据中英文提示单词拼写)

7 . My teacher asks me to write a report about a book ________ name is Christmas Carol. (用适当的词填空)

8 . Eventually, it manages to reach the places ________it will spend the winter. (用适当的词填空)

9 . Do you know the year ______the Chinese Communist Party was founded? (用适当的词填空)

10 . The oldest zoo in China is Beijing Zoo, which ________ (found) in 1906. （所给词的适当形式填空）