I now regret ____ school so young.
A. to leave
B. leaving
C. to have left
D. being left
--I’m so tired. --You ____ take a rest.
A. can
B. have
C. should
D. need to
There is something wrong with my teeth. I have a _______.
A. toothache
B. headache
C. stomachache
D. heartache
Can you tell me how the accident ______?
A. came about
B. came back
C. came down
D. came from