单项选择题

I was so ______ in my book that I didn't hear the door bell ring.

A．concentrated
B．absorbed
C．engaged
D．occupied

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单项选择题

The question arises as to （）should go out this morning in this below-zero weather to clean the snow from the entrance.

A．which
B．who
C．whom
D．those who

单项选择题

It can be inferred that the project of building the opera House started when （）

A．more and more citizens were eager to watch operas
B．a committee decided to hold an important meeting in Sydney
C．Sydney became more and more civilized
D．more and more citizens became dissatisfied with the vacancy of an art center