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.

A Du’s unique voice ________ especially to young people.

 Such films _____ shown yesterday ______ not worth seeing again.

 Sir, a Mr. Wang is waiting for you at the gate. ________ he come in or stay there?

When ________ to danger and conflict, men tend to increase blood pressure, ________ nervous and anxious.

 It’s too bad that I failed in the math exam. If only I ______ hard at it!