By the time I joined Greener Group,they (义务打扫图书室) for 2 years.(volunteer)
We will have a party in the classroom . (后天)
Nowadays, many foreigners learning Chinese. (对……感兴趣)
are those who make you smile, always open their hearts to you and encourage you to succeed. (friend)
2018Football World Cup is being held in Russia now. It is the Football World Cup. (twenty-one)
The young should learn to make decisions by . (they)