To learn Chinese cooking, you should practice _____.

（ ） we have all the materials ready, we should begin the new task at once.

The number of deaths from heart disease will be reduced greatly if people _____ to eat more fruit and vegetables.

I’m not used to （ ） in that impolite way.

The grain output of this year is much higher than _____ of last year.

—Shall we invite Tim? —No， it’s too late to invite any more people. _____， he hates parties， you know.

You needn’t introduce him to me. I’ve met him on several _____.

（ ） you do, you should put your heart into it.

The government cannot operate effectively （ ） it is free from such interference.

After （ ） the numbers in every possible combination, we finally hit on a solution.

I have made_____I will never go back on my words.

A news report is usually very short, （ ） when it is about something very important.