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
By the middle of the 21st century, the vast majority of the world's population will be living in the cities ______ in the country.
A. other than B. more than
C. better than D. rather than
