As an excellent translator , he reached a high level of ______ in his English.

(2013·四川成都二次诊断)—What are you two whispering about over there?—Oh, ________.Just small talk.

They have been told that if they want to build a highway between the two towns, they should first try to____ how much it is going to cost.

Though the new apartment is____than the old farmhouse, I really like it.

It makes great sense to check and ____________ the brakes（刹车）regularly.