在下面对话的空白处填上适当的话语（话语可以是句子、短语或词），使对话完整，将答案写在答题纸的相应位置上.（共10分，每小题2分）
A: ___________________________, sir ?
B: Yes, please._______________________ a pair of sports shoes.
A: What size do you want, please ?
B: Size forty one.
A: OK! What about this pair ?
B: Size forty one.
A: OK! What about this pair ?
B: Sorry ! I ______________ black shoes.
A: Oh, we 've also got blue ones.
B: Can I __________________ on ?
A: Yes, please .
B:__________________ each pair ?
A: Thirty- five yuan.
B: All right. I 'll take it.
中国终于有了自制的航空母舰，这确实值得骄傲．
China has owned its first homemade aircraft carrier finally．That's really something to be ．
If you want to become thinner，you'd better eat less before you go to bed．（改为同义句）
If you want to weight，you'd better eat less before to bed．
It will be 20 years since Hong Kong returned to China on July 1，1997．（就划线部分提问）
years will it be since Hong Kong returned to China on July l，1997？
孩子们高兴地在那儿互相扔雪球．
The children are happily snowballs each other over there．
如果我们都齐心协力，我们就会完成这项任务．
If all of us ，we're going to finish the task．