Listen! I hear some birds ___________ the tree.A. sing in B. singing in B. sing on D. singing on
There _____ an exciting party at Mr. Wang’s this evening.
Are you free now? I have ___________ to tell you.
There is a ______ tree in our school.
He spent a week ____ the novel.
— I broke the window. — You ____ play football near the window. A should B. shouldn’t C. had better D. must