Beijing’s bid for ______2022 Winter Olympics has driven public enthusiasm for winter sports to ______ new heights.
| A．a; the | B．/; / | C．the; / | D．/; the |
When it air pollution, Beijing faces the three “C” s，cars，coal and construction，which lead to Beijing's thick air pollution．
| A．refers to | B．comes to | C．happens to | D．speaks to |
Once education is made free，many children who have dropped out of school .
| A．will come back | B．came back | C．have come back | D．had come back |
When I lived with my roommates in the university, we often talk into the night
| A．might | B．could | C．should | D．would |
Not until quite recently that language is closely related to culture．
| A．he realized | B．did he realize | C．had he realized | D．he did realize |
Many of friends British people make at school remain friends for life, so it is true that schooldays are “the best of life”.
| A．the；不填 | B．the; the | C．不填; the | D．不填；不填 |