A professor of biology gave a talk to more than 1000 students on elephants living conditions and the dangers ______

A professor of biology gave a talk to more than 1000 students on elephants living conditions and the dangers _______ them.

#102758

face

facing

faced

are facing

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 —I wonder what makes you a successful manager.—I ________ as a waiter for five years，which contributes a lot to my today’s work.

#99873

serve

have served

had served

served

The information that    will become your ability once you use it．

#100450

absorbs

is absorbing

is absorbed

had been absorbed

 It is said that the student 　　　　 seriously ill for two months last semester.

#103143

was

had been

has been

 __________ to sun, rain and wind for a long time, the stone split（裂开）.

#101764

Being exposed

Having exposed

Exposed

To expose

You will have to wait for one more week, when the manager _____ back from his trip.

#103222

will be

comes

is going to be

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