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

1、[单选题]I don’t know whether you happen ________ , but I’m going to study in the U. S.
this September.

• A、to be heard
• B、to be hearing
• C、to hear
• D、to have heard

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2、[单选题]The flowers ________ sweet in the botanic garden attract the visitors to the beauty of nature.

• A、to smell
• B、smelling
• C、smelt
• D、to be smelt

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3、[单选题]________ with the size of the whole earth, the biggest ocean doesn’t seem big at all.

• A、pare
• B、When paring
• C、paring
• D、When pared

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4、[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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5、[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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