改错句.（把句子中括号里的单词错误的在句后改正） 1.He (washes) (his) face (two times) (a day)._____
2.We (need) (be) (quiet) (in) the library._____
3.(Not) (throw) rubbish (on) the floor,please._____
4.I (should) (to make) some (medicine) (after meals)._____