1 . I’ll go to the party with you ________ you don’t wear those strange trousers.

A．on condition that

B．as soon as

C．as though

D．in this case

2 . The coach’s fitness exercises will have no weight-losing effect________ you keep working out regularly.

A．as

B．wherever

C．though

D．unless

3 . ________ you start with one small positive thing during your day, you’ll begin to move into a more positive situation.

A．Even if

B．In case

C．As long as

D．As far as

4 . ________you have access to stairs, there are numerous exercises you can do________ just two stairs.

A．Unless, to use

B．While, using

C．If, using

D．When, use