We do not know how astronauts can ________ when they spend months in space without the protection of the atmosphere.
tomorrow, our ship will set sail for Macao.
----She looks very happy. She have passed the exam. -----I guess so. It’s not difficult after all.
fire, all exits must be kept clear.
It is worth considering what makes “ convenience”foods so popular, and ______ better ones of your own (2008 .北京)
The message is very important, so it is supposed as soon as possible. (2008 .陕西)