________ many times，I stilldidn’t know how to operate the machine.

Currently，many Americanwomen are still faced with the _____ of choosing between work and family commitments.

London Has Fallen is ___________ exciting film, I think.

When Miss Green asked us ________ silent,we stopped ________ at once.

Everybody except the two young boys _______ shocked bythe bad news. People looked at each other in ________.