4.She owes her wealth_____hard work and good luck.

－How about going downtown this morning? －Well,it’s a bit too cold outside And ,I’ve got to do some homework [ ]

uld well balance our work and relaxation, and only by doing that, aseverybody would agree , ______ a good state of mind.

What do you like to do in your leisure time— I enjoy ____ with my friends.

The Chinese ____ prefer tea to coffee[ ]