We have done much to protect the environment. So the river is getting than before.
A. dirtier B. dirty C. cleaner D. clean
Many city people their bikes to work every day.
A. ride B. will ride C. rode D. have ridden
Before you go to Canada, you need to learn more it.
A. form B. in C. by D. about
Everyone likes my father because is friendly.
A. his B. him C. he D. himself
根据短文内容及首字母提示完成所缺的单词
Adults smile less than children do in a day．386 times less，in fact．As a result，we are becoming more and more unhappy and u________．
All human beings are b________to know how to smile．Children are s________to smile up to 400 times a day．For them，a smile comes from their h_______and pleasure．Unluckily，as we grow o________，we smile less and less．
“Adults only smile 14 times a day，”says Jamb，a researcher．That means we only smile e________two hours．
“Life has so many problems that we have forgotten all the r________to smile，”she says．
We just need to look for things that m________us smile．“Why are you afraid of a smile？”Jamb asks．Trying best to smile is the s______of your happy journey！And anyway，s________is a nice thing to do．
1．________ 2．________ 3．________ 4．________ 5．________
6．________ 7．________ 8．________ 9．________ 10．________
________（thousand）of students rushed out to celebrate their victory（胜利）．
