She writes ___ from time to time.

Some people thought ________ possible to live on out space in the future .

—Is Mike a diligent student?  —No，but he is a lazy one，if   ___         ．

---What kind of people do you need for the position? --- __________ with a good command of English.

--- Do you have __________ else to say for your mistakes?  --- ________ but sorry.