1 . _____ time, the teacher had us do half of the exercises in class and complete the other half for our homework.

A．To save	B．Save
C．Saving	D．Having saved

2 . What way are you thinking of _____ rid of the flies?

A．to get

B．getting

C．being got

D．to be getting

3 . —Shall I turn on the TV, Mom?
—No. You should be quiet _____ wake up your sleeping brother.

A．so not as to

B．so as not to

C．so as to not

D．not so as to