根据汉语意思选择正确的单词。环境A. paperB. environmentC. litter
---What are you doing? ---- I am _____ a letter. A.sending B. writing C.Both A and B
What is ____ envelope? A. a B.an C ./
We put the address on _____ right. A.a B.an C.the
What Toms father do? A. do B. does C. doing
Can Mary Chinese? A. speak B. speaks C. speaking