____the working efficiency,the boss allows the employees to have a coffee break.
Stephen Hawking believes that the earth is unlikely to be the only planet life has developed gradually.
The plan just because people were unwilling to cooperate (合作).
I stayed there for only two days but felt like two weeks.
— Do you really want to go out? — It may rain. , I shall go out; I don’t mind the rain.
Many students are about football. They play a game whenever possible.