—Tina failed in the math test. She looks very sad. —Let’s come to cheer her ________.
_____ you can understand how the human body woks, you need to have some knowledge of chemistry
---I hear the government is going to ___ the air quality with the new standard PM2.5,isn’t it?---Yes, ___ the air pollution will get more serious.
--Wow, ____useful and fashionable iphone5s you have bought!---Yes, it is ____ great help to me, ____ I must say it also cost me a lot.
一Daniel,the principal cancelled today’s school concert.I am feeling bad about it.— There will be another concert this weekend.
Jim did n’t understand.