Nuclear energy may be dangerous if                          

________ from endless homework on weekends, the students now find their own activities, such as taking a ride together to watch the sunrise. 

 Many activities in the shop, _______ many different types of interest, are planned _______ its out-of-date goods.

Those relatives were________ people. After a few days, I was getting________ and homesick.

________ global temperatures rising, the UN Climate Change Conference was held in Cancun（坎昆）, Mexico last year．