Our government has tried many ways to _________ the smog haze(雾霾) problem. Maybe we’ll have a clearer sky in the near future.

e was young, he used to ______ hard at hislessons.

think 3,000 yuan is enough to ______his needs for the tour to Beijing

It’s a fine day. Would you like to go bike riding—_______________.

The red flag looks extremely beautiful the blue sky and white clouds