Passengers ________ smoke on high-speed trains. If you do, you will have to put off ________ a train for 180 days.
A.can; take B.shouldn’t; taking C.mustn’t; to take
How kind you are! You always do what you can ________ others.
A.help B.helping C.to help
Excuse me, sir. Could you please ask your son ________ here? Everybody is reading silently.
A.doesn’t play B.not to play C.not play
Today the Internet makes ________ possible for people ________ different kinds of things online.
A.it; buying B.this; to buy C.it; to buy
— What did you do last Sunday morning?
— I tried to make my ________brother ________ when my mother went out.
A.ten months; to stop to cry B.ten-month; stop crying C.ten-month; to stop crying
My father ________ drive his car to work, but now he ________ riding to work.
A.used to; is used to B.used to; used to C.is used to; used to
