一、单项选择 (15分)
( )1.We all think _________ is kind ________ you to give your seat to a young lady with a baby in her arms yesterday.
A. that, for B. it, for C. it, of D. that, of
( )2. My father ___________a lot, but now he __________.
A. used to smoke, has given up it B. is used to smoke, has given up it
C. is used to smoking, has given it up D. used to smoke, has given it up
( )3. Dung is kind and helpful, but he is also a little careless _____________.
A. at time B. at a time C. at times D. once a time
