—What are you doing, Jack?— Make a model plane. I __________ it in the science class at 10 o'clock tomorrow morning.
He is a man of few words, and seldom speaks until _______ to.
-- May I smoke here? -- If you____, that's the smoking section over there.
---How do you find James Cameron's 3D version of Titanic? ---Fantastic! It can't be _______ and has brought us a wonderful experience.
It was the belief ____ Alex Haley could find his root in Africa ____made him decide to go to Zombia.
The boy went swimming in the deep lake,his mother's fear for his safety.