Why was it so noisy on the fourth floor just now—Oh, I forgot to tell you. Many children _______ Ann’s birthday there.

Sam is a little weak in English and he has _____ what the teacher says in class.

Mike , you look so excited.—Yeah! There a tennis game played by Li Na this evening.

Climbing Mount Tai greatskills and notwithout risk.

Must I take a bus?— No, you _____. You can walk there.[ ]