Would you mind of I close the door?
–Is Tony home? -Yeah, he’s just _______ back from Chengdu.
Sam is a very good man. He always tries __________ best to help others.
We will have a big test ___________ June 12th. Good luck to you.
Who is ___________ man under the tree?
More trees to protect the environment.A、must plantB、must be plantedC、should plant