II.单项选择。(15分) ( ) 1. We should take care ______ ourselves. A. with B. of C. for ( ) 2. Eating a lot of fruit and drink ______ water is good for your health. A. a plenty of B. a plenty C. plenty of ( ) 3. You have a toothache. You’d better ______ hot food. A. not to eat B. not eat C. not eating