.At this moment the bell rang ______

.At this moment the bell rang _______ the end of class.

#97431

announce　

announcing　

announced　

to announce

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Birds'singing is sometimes a warning to other birds________away.

#92175

staying

stayed

stay

to stay

Time, _____correctly, is money in the bank．

#90195

to use

used

using

To use

These chairs may look good, but they’re very un-comfortable _____.

#90864

to sit on

to be sat on

sit on

sitting on

_________, the experiment is sure to succeed.

#90652

If carefully doing

If carefully done

If it done carefully

If it doing carefully

He got wellprepared for the job interview，for he couldn't risk________the opportunity.

#88480

to lose

losing

to be lost

being lost

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