As you know, it is my duty to __________ my younger sisters from being hurt when they are in danger.
So many people! Could I stand here? ____ Don't you see the sign "Line up, please"?
If you for your favorite TV programs, you will feel sleepy.
—Where is your brother? —He has gone to Beijing. Heback in three days.
—Ann, I am worried I’m getting fatter. What shall I do? —I think you should eat________ food and do more exercise.
they are twins, they don’t look the same at all.