–You are Mr. Zhang, aren’t you? --______. 

On snowy days, you have to drive very ________ to avoid traffic accident.

Contrary to popular belief, taking a walk immediately after meals doesn’t _______ do good to our health.

Most of the evidence was destroyed in the fire. _____, it would be almost impossible to prove Jim guilty.

It’s always difficult being in a foreign country, ________ if you don’t speak the language.