It will ______us several years to learn a foreign language well.

He must have been annoyed by something yesterday, _____?

(2014·济南4月巩固性训练)________it is，the boy never seems to be able to finish it off.

What do you think of the film acted byJackie Chan —-Oh, I don’t like it at all. It isvery________.

udents were studyingin____________classroom when, all of ____________sudden,the lights went out.