﹣Hi，Tom．I haven't seen your parents for days．Where are they？
﹣They aren't at home．They_______ America for holiday．（ ）
| A． |
were in |
B． |
have gone to |
| C． |
have been to |
D． |
will go to |
I don't know he will come or not this afternoon．（ ）
A．ifB．whenC．whether
﹣ did you write to last night？﹣A pen pal．（ ）
A．WhatB．WhereC．Whom
She is listening to music he is doing his homework．（ ）
A．afterB．beforeC．while
He is at English than me．（ ）
A．goodB．betterC．best
It's our duty our hometown clean and beautiful．We must do something for it．（ ）
A．keepingB．keepsC．to keep