(  )1. If you show your ticket, I’ll let you        .

A. in                                       B. to                                   C. to go in

(   )2. I don’t know if she        tomorrow, if she        , I’ll call you.

      A. comes, comes                                   B. will come, will come 

C. will come, comes                       D. comes, will come

(   )3. We have been walking        8 o’clock.

      A. for                              B. at                             C. since

(   )4. Amy has been skating        too hours.

      A. for about                            B. for since                          C. since