1．Many young people, most of ________were well educated, headed for remote regions to chase their dreams.
2．We will put off the picnic in the park until next week, ________the weather may be better.
3．Scientists have advanced many theories about why human beings cry tears , none of ________ has been proved.
4．He wrote many children's books, nearly half of ________ were published in the 1990s.
5．Creating an atmosphere ________ employees feel part of a team is a big challenge.
6．The books on the desk，________covers are shiny, are prizes for us.
7．The number of smokers, ________ is reported, has dropped by 17 percent in just one year.
8．Some experts think reading is the fundamental skill upon ________ school education depends.
9．The store ________ I bought my textbooks is having a sale this week.
10．We are living in an age________QR codes(二维码)are becoming more and more popular in our daily life.
11．Lichun is a Chinese word for one of the 24 solar terms，________ means the beginning of spring.
12．Following the girl, we went into a hall; on ________walls hung a few pictures of some famous scientists.
13．They will fly to Chicago, ________ they plan to stay in for two or three days.
14．I have had such a case ________a boy whispered to his deskmate now and then while I was having lessons.
15．Sometimes we have to face embarrassing moments ________ we can only keep silent.
