Martin has been working hard and comes top in the class.— It is his mother’s love that helps him feel good about .

He __________a basketball，but a baseball．

I am so _____ when I heard the ________ news.

Shall we go hiking this Sunday? －Sorry, I _______. I’ll have to take a piano lesson.

Look at the boy running on the ground. Is it Davis?—It ______ be him. I saw him go to the teacher’s office just now.