Taking photos with _____ real tiger is _______ unusual experience for us.
| A．an; an | B．a; an | C．the, a | D．a; a |
The old man __________ eats junk food, does he?
| A．sometimes | B．often | C．seldom | D．usually |
Tari Apps（打车软件）can help us travel around more easily．____more and more people like using them．
| A．Or | B．So | C．And | D．But |
—Listen ! Helen is singing in the next room.
It ____ be Helen. She has gone to Beijing.
| A．can’t | B．mustn’t | C．may | D．needn’t |
-The presidents of China and the USA had ________ interview a short time ago.
—And it was ________ great success.
| A．an; / | B．the; a | C．an; a | D．the; / |
— What's wrong with your uncle?
— We're sure _______ something is wrong with him, but we doubt _______ the disease can kill him.
| A．if; whether | B．that; that |
| C．whether; if | D．that; whether |