1 . I_______ _________ __________the photos on the noticeboard__________ I heard a voice behind me.
我正在看布告栏上的照片，这时我听到身后有个声音。

2 . I’m waiting for Jack.________, I will go swimming alone.

A．If he doesn’t come	B．If he won’t come
C．If he will come	D．If he is coming

3 . —Would you like to go hiking with me, Susan?
—I’d like to, _______ you don’t want to go alone.

A．until

B．before

C．if

D．after

4 . ——Did she agree with you?
——No.      I said, she didn’t believe me.

A．What

B．Whatever

C．Which

D．That