The teacher asked the boys ____on the wall.

All of us still remember the terrible tsunamithat _____ the areas in the southeast of Asia in 2004.

I like math. It’s difficult ________ really interesting.

What do you think of the house—_____It is everything we have been looking for

I won’t attend the meeting _______ him, _______ I have too much to do these days.— I see.