When I entered the step-classroom (阶梯教室), the lecture __________ and the audience __________ attentively.
#101262
A
began, listened
B
was begun, was listening
C
had begun, listened
D
had begun, were listening
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 Everything he _____ to his country.
#103067
A
had was contributed
B
had been contributed
C
had to be contributed
D
had contributed
——You see how thin Ann is!——She ______ gain some weight but she______ too little.
#99970
A
would; ate 
B
will ; eats 
C
would ; has eaten 
D
will ; is eating
---Where are your parents? ---They are in the kitchen, they ______the dinner for the party the whole day.
#100575
A
are preparing
B
have been prepared
C
have been preparing
D
were preparing