下列字母中一笔写成的是 ____。
— Could you tell us ______ ? —About two weeks.
The first thing ______ we should do is to tell him the news.
What way can you think of ______ the mice in the room?
Yuan Longping, a great person in China, _____as “father of hybrid rice”
______ the work is difficult, all the workers are keeping on working .