_____ your timely advice,I would never have known how to go about the work.

If your car _____ any attention during the first 12 months, take it to authorized dealer.

What they are ____ about is which comes first: the chicken or the egg?

I never regretted _____ his offer, for it was not where my interest lay.

关于问诊中现病史的询问不包括

He noticed the helicopter hovering over the field. Then to his astonishment, he saw a rope ladder _____ out and three men climbing down it.

Bread and butter____liked by Westerners.

Arriving at the bus stop, _____ waiting there.

The first paragraph is intended to ________.

形成潜影的先决条件是