--May I watch TV for a while, Daddy?--If you _____, remember to turn it down a bit.
#86977
A
Should
B
must
C
could
D
might
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—What caused the accident?—It was my fault, sir. I _____ to the left.
#89511
A
ought not to have turned
B
needn’t have turned
C
shouldn’t turn
D
couldn’t turn
The students ______ to write English words carefully from the beginning. 
#87647
A
be trained
B
should be trained
C
train
D
to train
— Did you scold him for his mistake?— Yes, but _____ it.
#90436
A
I’d rather not do
B
I’d better not do
C
I’d rather not have done
D
I’d better have not done
Thank you for giving me a hand. I ______ in the experiment without your valuable help. 
#89288
A
have failed
B
will fail
C
would have failed
D
must have failed