1 . Liu opened her mouth as if _     something to Calaf, but gave up seeing his passionate eyes locked on Turandot.

A．to say	B．wanted to say
C．saying	D．to be saying

2 . It is suggested that all these gifts be mailed immediately _________ in time for Christmas.

A．in order to have received	B．so as to receive
C．so as to be received	D．so as to be receiving

3 . Everyone here will thank the firefighter for the things they have done to prevent fires______the environment safer.

A．make

B．to making

C．to make

D．from making

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

A．to get

B．getting

C．being got

D．to be getting

5 . ______ which school was suitable for their son, the parents visited lots of different primary schools   in the city.

A．Finding

B．Being found

C．Found

D．To find

6 . —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