Whitney Houston’s sudden death suggests that drug abuse is such a serious problem ______ we should deal with properly.

I don’t like Xiao Shenyang’s performances________ many people like them.

When you state your plan to improve the service of the hotel at the meeting, remember not to_____ any important details.

86 — What does your father do— He was a _________in the post officebut now he is promoted to the postmaster

you haven’t been acting like yourself.Everything is OK―_________.