------________ are you staying in China? ------For about two months.
-----Do you know how long the diameter of the Mars? -----It’s didmeter is 53%_____that of the earth?
I swam in the river and caught a small fish yesterday afternoon. ----_____
---how many students are there in the classroom? ---_____Idon’t know where they have gone.
Our playground is not so tidy and beautiful as before. Students must _____ dirty things on it.
I _____ this book for two weeks. I have to return it now.