[单选题] ________ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.

1、[单选题]“We can’t go out in this weather,” said Bob, ________ out of the window.

• A、looking
• B、to look
• C、looked
• D、having looked

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2、[单选题]The research is so designed that once ________ nothing can be done to change it.

• A、begins
• B、having begun
• C、beginning
• D、begun

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3、[单选题]According to a recent U. S. survey, children spend up to 25 hours a week ________ TV.

• A、to watch
• B、to watching
• C、watching
• D、watch

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4、[单选题]Sarah, hurry up. I’m afraid you can’t have time to ________ before the party.

• A、get changed
• B、get change
• C、get changing
• D、get to change

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5、[单选题]Having been attacked by terrorists, ________ .

• A、doctors came to their rescue
• B、the tall building collapsed
• C、an emergency measure was taken
• D、warnings were given to tourists

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