after； during； pollute； do； pay for； animal； work |
（1）China has made great progress the past forty years．
（2）We should be friendly to ．We are all living in the same world．
（3）How much did you your new bicycle？
（4）If the air is it is dangerous and will do harm to our health．
（5）My father is a good teacher who for his students day and night．
Choose________ how you spend your spare time and with whom you spend it
(wise)
If you buy a blind box, you’ll get a box with a(n) ________ item inside. (known)
TianWen 1，China's （one） Mars probe （探测器） successfully entered space in February.
We are （excite） to see that Chinese vaccines （疫苗） are used around the world now.
Each of （we） should study hard and do something for our country.