China's Tianwen I Rover landed on Mars on May 15th.2021.Do you know _______?( )
A.what it was going to discover
B.why was it sent there
C.what it looks like
D.how many photos does it take there
The policeman asked us _____him send the old man to the hospital.
()If there _____ no buying and selling of animals, there will be no killing in nature.
In summer milk will quickly go bad_____ it is put into a fridge.
I still remember my first teacher we haven’t seen each other for many years
I’m sorry I’m very busy now.If I ______ time, I ______ come to see you.