When theaccidenthappenedinthefactory , theworkers__________ screams of terror.[ ]

I can’t get into my room because I ________my key.

___ regular exercise is very important, it’s never a good idea to exercise too close to bedtime.

Little_____ about A-H1N1 so far, so there is no doubt that many people are afraid when talking about the disease.

16. It is reported that they ____ arms andbegan to fight against the invaders .