用括号中所给词的适当形式完成句子。

1.  She always eats thin meat ____(keep) thin.

2.____   (communicate) is very important between lovers.

3. Now the students in China get         (much) exercise than years ago.

4. The father often keeps him____ (take) different lessons.

5. Work____(hard) and you'll do better in your studies.

白虎汤中石膏与知母的配伍意义是（）

A.“相使”为用，清热泻火，益胃生津

B.“相须”为用，苦寒以直折之势，以治高热

C.“相须”为用，清泄肝胃，清退虚热

D.“相须”为用，清热除烦，生津止渴

E.以上都不是