( )（5） Please ___________ go in. It says ‘Danger!’.
A. not B. can’t C. don’t
( ) （4）Today is________ day of school after the holiday.
A. the one B. first C. the first
( )（3）——Whose skateboard is this?——
A. Helen’s. B. My sister.C. It’s Helen.
( ) （2）They asked _______some questions ________ English.
A. me; about B. I; about C. I; with
( ) （1）— Here’s a postcard for you, Jim! — Oh, ___ is from Mary.
A. he B. it C. she