Once new difficulties _________ in your work, it’s always important to use your brains．

When the peace talk failed．There was a fear that war may ____________ at anytime．

_________ seems no sense in complaining．We should take action now．

The TV play series The Revolution of 1911, broadcast on CCTV1 lately, is ________ the 100th anniversary of The Revolution of 1911.

Bob looked back only to find an old classmate whose name ________ him for the moment.

 If better use is ________ your spare time，you’ll make good progress in doing your business.

Many scientists have believed that there may be a _________of life on the Mar．

Steve Jobs’ death _______ quickly and soon became the talk of the whole world.

I think the English song is _________ worth _________ again.

 New technology is being ________ almost every industrial process.