Mr. Smith couldn’t open the door because his naughty boy ______ it from the inside.

The zoo worker told the visitors that in the case of a highly ________ animal,performance training is easy and not so painstaking. [ ]

Have you ever watched ______ latest documentary, A Bite of China— Yes, I like it very much. It even makes my mouth water.

most parents care about is to provide the best education for their children.[ ]

The students are warned not to talk about anything ______ to the accident that happened the other day in the school.