You should study harder______ it is too late to catch up.
A. if B. when C. after D. before
Tell the boy the news. He is ______to understand it.
A. enough old B. enough young C. old enough D. young enough
Class is over. Let’s stop______ a rest.
A. having B. to have C. had D. have
--- _________ difference the day made! We were very happy.
A. what B. how C. what a D. how a
--- I didn’t bring back anything from America.
--- _________ at all? Why not?
A. Anything B. Nothing C. Something D. Everything
I don’t know if Mike _______to my school tomorrow.
If he____, I will be very happy.
A. comes; comes B. came; will come
C. will come; comes D. will come; came
