This tall building has _______ floors. And Tony lives on the ______ floor.
A. twelve; twelve B. twelfth; twelfth
C. twelve; twelfth D. twelfth; twelve
My bicycle doesn’t work. I’ll ask Uncle Wang __________.
A. fix it up B. to fix up it
C. fix up it D. to fix it up
—— Would you like ________ camping with me ?
—— I’d like to. But I’m busy ______ my homework.
A. to go ; to do B. to go; doing
C. going; to do D. going; doing
—— How does Jack usually go to school?
—— He ________ ride a bike, but now he is used to ______ there.
A. used to; walk B. was used to; walking
C. was used to; walk D. used to; walking
You should _______ the bus when it stops.
A. get off B. cut off
C. take off D. put off
We really don’t know ________ . Could you help us？
A. how to do B. what to do
C. to do what D. to do how
