He is only too ready to help others, seldom, , refusing them when they turn to him.A．if neverB．i——青夏教育精英家教网——

He is only too ready to help others, seldom, ____, refusing them when they turn to him.

If _____ carefully, the experiment will be successful.?

The research is so designed that once _____ nothing can be done to change it.

B．having begun

In Switzerland, six miles west of Geneva,___________ a collection of laboratory buildings.

He is a man of few words, and seldom speaks until _____ to.

In that month, he earned as much as, if ____ than, $40 000.?

—Will you go fishing with me?
—___________.

A．No, I'll be very busy	B．Yes, I'll be glad
C．Certainly, I'll be sorry	D．Certainly, I'll be glad to

—Why do you want the book so much?
　　—_______, sir.

I wonder why you won’t do it as_______. Its the third time you have done so.

The dying old man opened his mouth as if_______something.

C．to have said

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