After you finish the exercises, you’d better have your answers ___________.
A. checking B. checked C. to check D. check
It was getting dark, but the little boy didn’t know______________.
A. who can he ask for help
B. what was wrong with the bike
C. where can he go to mend the bike
D. if he could arrive home on time or not
I don’t doubt ____________ she can do it well, but I doubt _________ she is willing to do it.
A. that; if B. that; that C. if; if D. if; that
It’s nice ___________ the doctor to devote all the time he has _______ for the patients.
A. of; to care B. for; to care C. for; to caring D. of; to caring
--What’s wrong with you , Eric ? You look tired .
--I ______ to prepare for the final exam last night .
A. picked up B. woke up C. stayed up D. put up
He realized his mistakes and took action to reduce the loss _________ it was too late.
A. until B. when C. before D. as
