[单选题] Having been ill in bed for nearly a month, he had a hard time ________ the exam.

1、[单选题]Reading is an experience quite different from watching TV; there are pictures ________ in your mind instead of before your eyes.

• A、to form
• B、form
• C、forming
• D、having formed

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

• A、To wait
• B、Have waited
• C、Having waited
• D、To have waited

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3、[单选题]Don’t leave the water ________ while you brush your teeth.

• A、run
• B、running
• C、being run
• D、to run

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4、[单选题]You were silly not ________ your car.

• A、to lock
• B、to have locked
• C、locking
• D、having locked

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5、[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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