[单选题] In peace, too, the Red Cross is expected to send help _________ there is human suffering.

1、[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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2、[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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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]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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5、[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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