19．China has warned America that it_____be responsible for its arms sale to Taiwan.

20．—I got up at five this morning, I thought it was Friday． —You _____ so early．It is Sunday today; you don’t have to go to work．

Why didn’t you buy the gold ring?— I ______, but I didn’t have the money.[ ]

Myfather will have a holiday nextmonth. He’ll take me to Qingdao.

Father’s Day is coming, I’m thinking about ______.