An old man began to collect rubbish along the river b （岸） years ago．
If you go to Beijing， make sure you visit China Science and Technology Museum．It’s my favourite museum in the （整个的） country．
What you learn at school plays a very important part in shaping your behaviour in （社会）．
Why don’t you （邀请） Jeny to play sports in the playground tomorrow morning？
Tom kept calling me for years， （基至） after he graduated．
This is the （第三） time that I have been in Nanjing．