用所给单词的适当形式填空。（共6小题；每小题1分，满分6分） December is the __________ (twelve) month of a year.
As we all know, the silk dress feels __________ (soft).
She said to the twins, “Help ___________ (you) to some fruit.”
You should do your homework as ___________ (careful) as your sister.
The foreign teacher gave us some ___________ (advice) on how to learn English.
__________ (teach) high school students in a poor mountain village may not sound like fun to you.
—Excuse me, may I speak to Linda?
— _____
A. Who are you? B. Is that Linda?C. This is Linda speaking.
—Hi, Lily. Happy New Year!
— _____
A. Thank you. B. Yes. C. The same to you.
There are some students _____ on the playground.
A. run B. running C. to run
Sam _____ walks to school. He always goes to school by bike.
A. sometimes B. often C. never
—Excuse me, _____ I borrow this book?
—Of course.
A. will B. may C. must