Is______necessary to change trains at Beijing?
| A．this | B．that | C．it | D．he |
As is known to all, China _______the group of developing countries.
| A．belonging to | B．was belonged to | C．belongs to | D．is belonged to |
There is no doubt _______international cooperation is the key to dealing with cyber crime.
| A．then | B．that | C． wheather | D．this |
---They are quiet，aren’t they?
---Yes. They are accustomed ________at meals.
| A．to talk | B．to not talk | C．to talking | D．to not talking |
He risked __________ his job to see me off.
| A．Losing | B．to risk | C．being lost | D．Lost |
He is a strict but kind teacher, ___is always trying to make his classes __ and interesting .
| A．one ; living | B．one who; lively | C．he ; lovely | D．he who; live |