You have never met each other before, ______?

Frequent cultural exchanges will certainly help ______ friendly relation between our two universities.

We wouldn’t lose courage even if we ______ again.

It is most important that one of the brakes on your bicycle ______ properly.

These factories are ______ to the foreign trade company.

Let’s sing together, ______ ?

If you don’t pay your bill, they will ______ your gas.

All of my efforts to ______ peace failed at last.

The laws to be made have to ______ to various special interest groups.

Four weeks ______ for making the necessary preparations.