These three teachers vary_____their manners of teaching.

These tickets for the performance are （ ） until the end of the month．

It was in Johnson’s hotel （ ） the business meeting was held last year.

A new technique （ ）, the output as a whole increased by 20 percent.

My mother suggests that we _____ eat out for a change this weekend.

—Do you know （ ） they got to know each other? —It was last year （ ）they both taught Chinese in Scotland.

Dress warmly, （ ） you will catch cold.

Our students are free to study （ ） interests them.

It doesn’t matter _____ you pay in cash or by credit card in this store.

We’re going to _____ the task that we haven’t finished.

Because they are （ ） a date, many of us believe that they are in love.

Education cannot be （ ） in any country.