1 . He has a gift for creating an atmosphere for her students, ________ allows them to communicate freely with each other.

A．which

B．where

C．what

D．who

2 . A recent study found that the number of smartphone users _____ sharply so far.

A．has increased	B．have increased
C．is increasing	D．are increasing

3 . There is no point ______ it.

A．to get upset to

B．getting upset about

C．to get upset about

D．getting upset to

4 . He is the only one of the students who          very diligent.

A．was

B．were

C．are

D．is

5 . The factory produces half a million pairs of trousers every year, 75%          are sold abroad

A．of them

B．of that

C．which of

D．of which

6 . However, Tu Youyou had an idea          Chinese herbs might hold the secret.

A．that

B．which

C．what

D．whether

7 . As you can see, the reason          I’m here to tell you the story is          I made the right decision.

A．that; that

B．that; why

C．why; that

D．why; why

8 . During the polar summer of 1910-1911, both teams organized food bases in preparation for their journeys the next year. Then          the total darkness of the polar winter.

A．came

B．comes

C．come

D．coming

9 . The film brought the hours back to me ________ I was taken good care of in that far-away village.

A．when

B．until

C．that

D．where

10 . He was late for work this morning. That’s          he got caught in a traffic jam.

A．because

B．why

C．what

D．how