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

1、[单选题]The old man, ________ abroad for twenty years, is on the way back to his motherland.

• A、to work
• B、working
• C、to have worked
• D、having worked

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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]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]I’ve worked with child before, so I know what ________ in my new job.

• A、expected
• B、to expect
• C、to be expecting
• D、expect

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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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