（题文）The problem ______ tomorrow is important.
A. will be discussed B. discussed
C. being discussed D. to be discussed
We must find out ________ Karl is coming, so we can book a room for him.
A. how B. why
C. when D. where
He had nothing to do but ______ at the bus-stop in the rain.
A. to wait B. wait
C. waiting D. should wait
It is good manners to eat up ______ is left in your plate.
A. that B. what
C. which D. all
With time ______ by, my grandmother has much more silver hair.
A. went B. goes
C. going D. gone
David worked very hard and_______ set up a company of his own.
A. continually B. apparently
C. randomly D. eventually
