1 . The human has entered the AI era, ________ robots are used in ordinary life, bringing great convenience to people. (用适当的词填空)

2 . The National Day falls on October 1st, ______ he was born. （用适当的单词填空）

3 . He will put off the picnic until May 1st, ______ he will be free. （用适当的单词填空）

4 . Charlie Chaplin became famous in the 1910s, _______ films were silent and in black and white.

A．whose

B．which

C．what

D．when

5 . He will come to see me next July, ________ he won’t be so busy. (用适当的词填空)

6 . That summer,___________the other teams enjoyed their vacations, we met every day and practised passing and kicking the football. （单词的适当形式填空）

7 . Next month, ____________________________（你将度过你的暑假）in your hometown, is approaching. （根据汉语提示完成句子）

8 . I didn't become a serious climber until the fifth grade，________ I went up to rescue a kite that was stuck in the branches of a tree. (适当形式填空)

9 . But my connection with pandas goes back to my days on a TV show in the mid-1980s, _____ I was the first Western TV reporter permitted to film a special unit caring for pandas rescued from starvation in the wild. （用单词适当形式填空）

10 . Some language experts believe that 10,000 years ago, __________ the world had just five to ten million people, they spoke perhaps 12,000 languages between them. （根据句意填空）