28. The coat is______ than that one.

A. cheap       B. cheaper   C. cheapest   D. the cheapest

29. The 6th Beijing International Film Festival_______ on April 16, 2016 in Huairou.

A. was held            B. held        C. is held          D. holds

30.£­Do you know __________the Nature Museum?    

£­Next week.

A. when will they visit           B. when they will visit      

C. when did they visit            D. when they visited