－Haven’t youheard from your sister－____________She wrote a letter to me last week.

The man ____ around our school is from America.

What a beautiful city our hometown is! There are many trees _______ of the road!— Yes, and ________ of the trees is growing larger and larger.

He keeps himself._____of the current events by reading three newspapers a day.

Look, there is a lot of rubbish in the river.—Yes, it’s said that 80 per cent of fish in this river ________ live long.