________ a two-year period, Nancy became addicted to painkillers （止疼药）.

John seems a nice person. _______, I don’t trust him.

—Could you please lead your car to me this Sunday?
—_________you have it cleaned after using it.

. --- It remains to be seen _____ the plan can be carried out.
--- It is up to you.

．How long is it ______ we last spent the holiday in the country together?

．She is very dear to us. We have been prepared to do        it takes to save her life.

．Have you considered the students’ request _________ the school library _______ more books on popular science?

．A person ______ e-mail account is full won’t be able to send or receive any e-mails.

The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.

China is playing an important role in the world. That’s      Laura has come to study Chinese.