1 . —Mom, may I invite some friends to my party?     
—Of course. You can have _________ you like.

A．whenever

B．whatever

C．whoever

D．wherever

2 . ________ you are not sure about the answer, please discuss with your partners.

A．If

B．After

C．Unless

D．Although

3 . —What time will we have our meeting this afternoon?   
—Well, the meeting will be put off ________ the new manager comes.

A．till

B．though

C．while

D．if

4 . We can’t be successful ________ we keep working hard.

A．if

B．unless

C．because

D．when

5 . _________ the boy is so young, he knows more about science than some adults.

A．If

B．Though

C．Because

D．Unless

6 . Some students are cleaning the classroom ________ others are doing their homework.

A．since

B．or

C．while

D．as

7 . ________ I had a fight with my friend, we are still good friends.

A．So that

B．As soon as

C．Until

D．Although

8 . I’ll go to visit my aunt in England ________ the summer holiday starts.

A．while

B．before

C．until

D．as soon as

9 . No matter when you need help, please call me. (选出与句子画线部分意思相同或相近的选项。)

A．Whatever

B．However

C．Wherever

D．Whenever

10 . We have the ability to change the world ________ we are just teenagers.

A．if

B．because

C．so

D．though