People are concerned about the quality of the air they ______.

Memories ________on him as soon as he met the friend whom he had not heard from for over thirty years.

After he gave a report about the school, Mr White____ the visitors around it. 

. She thinks no one knows how much she likes him, but her face when I said he’d be there really ______!

You do need to _____ students’ great potential for learning English.