[单选题] Bob ran the 100 meters in 9.91 seconds, and I have not seen ________ this year.

1、[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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2、[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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3、[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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4、[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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5、[单选题]Having a trip abroad is certainly good for the old couple, but it remains ________ whether they will enjoy it.

• A、to see
• B、to be seen
• C、seeing
• D、seen

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