A hunter is a man who ______ animals.
A. catch
B. catches
C. will catch
D. was catching
I will visit you if Father ______ me.
A. let
B. lets
C. is letting
D. will let
Look out! That tree _____ fall down.
A. is going to
B. will be
C. shall
D. would
They can't leave until they _____ their work.
A. did
B. are doing
C. have done
D. has done