1 . The friend ______ she had been living for two years suddenly packed her bags and left.

A．with which

B．whom

C．with whom

D．who

2 . At the end of this activity, you will still have online access to carefully chosen familiar teachers with         you can discuss your confusing problems.

A．who

B．whose

C．whom

D．which

3 .         works for Douyin is that it is the first kind of platform for short videos not inspired by other western social media.

A．As

B．It

C．What

D．Which

4 . A range of lectures were arranged          the aim of discussing the impact of social media        sports event.

A．with; on

B．by; on

C．with; to

D．by; to

5 . One mistake will probably lead to another one. This is called a chain ______.

A．creature

B．solution

C．reaction

D．advance

6 . Like all our organs, the brain has evolved(进化), increasing in ______ and information storage, over millions of years.

A．cruelty

B．campaign

C．credit

D．complexity

7 . Chinese visitors were the highest-spending group visiting Switzerland, where they spent ______ average of 380 Swiss francs ($425) per person per day, according to Switzerland Tourism.

A．/

B．an

C．the

D．on

8 . The main reason ________ monarch butterflies are endangered is ________ lots of places ________ used to be home to them have been seriously destroyed.

A．why; because; where	B．that; because; where
C．why; that; that	D．why; that; where

9 . After a day’s travel, we ________ staying in a super little hotel by the sea at last.

A．made up

B．wound up

C．turned up

D．picked up

10 . Taylor said: “_________ child as she is, Kate should put forward _________ most difficult question for us to answer.”

A．/; the

B．a; the

C．/; a

D．the; a