The oceans are polluted by plastic waste． （heavy）
Chinese scientists have successfully cloned （克隆）two ．They are named Zhong Zhong and HuaHua． （monkey）
Children will be in danger in a swimming pool if their parents don't take good care of ．（they）
Yuan Longping is one of the （great） people that have ever lived， I think．
Their house is just like our house， but （we） has a bigger balcony．
Besides is beautiful forests and sunny beaches， Hainan Province has a lot more for you to explore． It is well worth （visit）．
Squirrels always like saving some food before winter comes． But they forget where （find） it from time to time．
At present there are many online courses and we can choose some to study by （we）．
Deep in his heart， Nelson Mandela wanted to help the black people to live （free）．
Miss White often has us （tell） interesting stories in her English class．
Our earth is becoming more and more （pollute） because of the rapid increase in population．
Can I help you， sir？
A box of （tomato）， please．
Oh dear! My mobile phone has turned into a brick． It's not working at all．
Well， it （happen）． Take off the battery and put it back on later．
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