Don’t promise anything ________ you are one hundred percent sure.
#37297
A
if
B
after
C
when
D
unless
推荐题目
This book _______ her 10 yuan, but I only ________ 5 yuan on the same one.
#43392
A
spends; spend
B
spends; cost
C
costs; cost
D
costs; spend
---How many girls are there in your class?   ---______ them_____ over twenty.
#36875
A
A number of, are
B
The number of, are
C
A number of, is
D
The number of, is
 Mr. Li makes me________, because it is bad for my health. 
#40987
A
don’t smoke
B
not to smoke
C
not smoking
D
not smoke