一Professor Li, ______the student start at once or wait a while?     一At once.
#88085
A
will
B
shall
C
can
D
may
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 ---Be careful! Your clothes will catch fire.  ---Thank you._______ so close to the fire.
#87970
A
I didn’t know I was
B
I don’t know I am
C
I hadn’t known I was
D
I don’t know I was
You are late. If you ____ a few minutes earlier, you ____ him. 
#86905
A
came; would meet
B
had come; would have met
C
come; will meet
D
had come; would met