Look! There are so many mistakes in your composition. You ________ have fixed full attention on it.
#86533
A
can
B
should
C
need
D
might
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____ keep it a little longer ? I want it very much . 
#89745
A
Able I to
B
Be able I to
C
Can I
D
Can I able to
---- If he had been warned, he ______ that food yesterday.---- Luckily he was sent to the hospital immediately.
#87412
A
would not take
B
would not have taken
C
had not taken
D
didn’t take
How I wish I _____ history when I was in university.
#86921
A
study
B
studied
C
would study
D
had studied