1 . ______ 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

2 . 当我感到忧伤时， 母亲就给我讲有趣的事使我高兴起来。
When I’m feeling sad, my mother always tells me funny stories to me .

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