Choose the best answer

1. At  present, we have a break that last fifteen minutes.It's  a ..........................................break
  A. fifteen-minutes        B. fifteen-minute         C. fifteen minutes                 D. fifteen minute
2. ...................... visiting Ha Long Bay? - That's a good idea.
   A. What about               B. Let's                      C. Should we                       D. Why don't  we
3. He....................... a play for  school anniversary celebration at the moment.
A. come along            B. rehearses                  C. is rehearsing                         D. watches