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At the age of twenty Steve left his hometown, _____ to return without making his mark.

 Though ________ in San Francisco, Dave Mitchell had always preferred to record the plain facts of small-town life.

 It was in the lab ___was taken charge of by our teacher____ they did the experiment.

The teacher asked the two students to discuss the question in a low voice ________ they should bother the others.

---He should have been warned of the danger.

---_______, but he wouldn’t listen to me.

The last decade of the 21st century ________ the rapid, steady development of China in various fields.

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

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

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

 Such films _____ shown yesterday ______ not worth seeing again.