1 . The lovely girl buys a birthday gift for her mother and wonders _________ she likes it or not.

A．until

B．if

C．whether

D．unless

2 . It's so quiet here! We can hardly believe ________ we're in the city centre.

A．what

B．if

C．that

D．where

3 . —Could I ask ________ you've mentioned this to her?
—Yes, but she refused to listen.

A．why

B．that

C．if

D．what

4 . Did Bob catch the plane last weekend? Could you tell me? (改为含宾语从句的主从复合句)
Could you tell me ________ Bob ________ the plane last weekend?

5 . Make sure_________ Mr. Smith will come to our party tomorrow.

A．that

B．when

C．if

D．where

6 . The man refused to say sorry to me, ________it was his mistakes.

A．because

B．when

C．if

D．even though

7 . Mother was cooking in the kitchen________ Jack was watching TV in the room.

A．if

B．as

C．when

D．while

8 . Everyone is born with the ability                . But                or not you can do this well depends on your learning habits.

A．of learning; weather

B．to learn; whether

C．for learning; if

9 . Do you know________there will be a soccer match on CCTV5 tonight?

A．that

B．if

C．where

10 . — Did you have a good time yesterday?
— Yes. We sang        danced until late at night.

A．but

B．if

C．and

D．so