1 . John is so independent that he never asks his parents’ opinion ________ he wants their support.

A．once

B．unless

C．since

D．because

2 . David is very noisy ______ Katy is rather quiet.

A．while

B．since

C．so

D．or

4 . ________ the sun was shining, it wasn’t very warm.

A．If

B．Although

C．Since

D．Because

5 . —Some English idioms are difficult to understand.
—Exactly, ___________ you know the meaning of each word.

A．if only

B．even though

C．as if

D．now that

6 . My grandparents dance square dances every day ________ bad weather stops them.

A．when

B．if

C．unless

D．once

7 . The concert was a great success — there wasn’t a single empty seat in the concert hall, ________ it was very cold.

A．although

B．unless

C．as

D．how

8 . ________ did this will be caught and punished sooner or later.

A．Whatever

B．Whoever

C．Whichever

D．Whenever

9 . You’ll speak English well ______ you keep practicing.

A．though

B．while

C．if

D．before