2 . She will hold a party on Saturday morning. And she’s worried about ________ you will be free then or not.

A．what

B．that

C．whether

D．if

3 . Does Simon often write to his penfriend? Miss Li asked. （合并句子）
Miss Li asked ________ Simon often ________ to his penfriend or not.

4 . I don’t know ________（是否） it is going to rain or not this afternoon.

5 . I wonder ________ (是否) you want to join our trip to Hong Kong or not.

6 . Oh, my god, I don’t know ________ or not I will have time to watch Jay Chow’s vocal concert(演唱会) tomorrow.

A．that

B．whether

C．whenever

D．if

8 . 我们的成功取决于每个人是否努力。
________________

9 . —I don't know ________（if）or not he will come here tomorrow.
—Don’t worry. He will come here tomorrow on time.

10 . The documentary(纪录片) about SIP is really great. It shows ________.

A．if SIP is a wonderful place to live or not

B．when was the high-speed railway in use

C．what has the government built in open spaces

D．how people's living conditions have been improved