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It _______ we had stayed together for a couple of weeks _______ I found we had a lot in common.

When _______a hand, one should say “Thank you” or “It’s very kind of you.”

Not until his mother came back_______.

—You should have thanked her before she left.
—I meant ________, but when I was leaving I couldn’t find her anywhere.

–Who should be responsible for the accident?
--The boss, not the workers. They just carried out the order _____.

__________, he talks a lot about his favorite singers after class.

Only by increasing the number of doctors by 50 percent    properly in this hospital.

The drive wanted to park his car near the roadside but was asked by the police ________ .

It is not who is right but what is right___is of importance.

It was about 600 years ago __________ the first clock was made.