—Mom, what did the doctor say?—He advised me to live _________ the air is fresher.
His spare time is made full use_______ law.
Mark needs to learn Chinese _______ his company is opening a branch in Beijing.
sales of cars up by 30% last year, the traffic in Beijing has become increasingly terrible.
It is recognized that the part ___ the UN plays in international relations is important.
Who would you rather ______ with the teacher about the problem?