. – We never know ________ he is.– They say he is a salesman.
The government has agreed to pay the firms extra sums to __________ for their financial losses.
You'd better not __________ the radio, or you will not be able to put it together again.
I still remember the days __________ I spent __________ with you in Beijing.
To do it by yourself is more important than __________.
In my opinion, life in the twenty-first century is much easier than __________.