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

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 man insisted ________ a taxi for me even though I told him I lived nearby.

• A、find
• B、to find
• C、on finding
• D、in finding

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3、[单选题]A cook will be immediately fired if he is found ________ in the kitchen.

• A、smoke
• B、smoking
• C、to smoke
• D、smoked

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4、[单选题]My advisor encouraged ________ a summer course to improve my writing skills.

• A、for me taking
• B、me taking
• C、for me to take
• D、me to take

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5、[单选题]The flu is believed ________ by viruses that like to reproduce in the cells inside the human nose and throat.

• A、cause
• B、being caused
• C、to be caused
• D、to have caused

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