I don’t know ______ Apple iphone4s.
A. that she is so crazy about
B. what is she so crazy about
C. why she is so crazy about
D. how she is so crazy about
I hate people ______ talk much but do little.
A. who B. which C. whose D. whom
—Could we go and watch the football game?
—No, ______ you have the tickets.
A. if B. unless C. because D. since
—Can I go to the park, Mum?
—Certainly. But you ______ be back by six o’clock.
A. can B. may C. might D. must
—I’m leaving now.
—______ you turn off the lights and the computer.
A. To make sure B. Make sure C. Made sure D. Making sure
The population problem may be ______ one of the world today.
A. the most B. most difficult C. the greatest D. more interesting
