In western countries, people like to keep quiet when they are in public. If there is someone talking and laughing loudly in a restaurant, the waiter will stop him at once .Which fits the western customs?
A．a : Sorry, sir. You have to speak in a low voice.b: What? It’s just my case
B．a: You shouldn’t speak so loudly. Or you must go away.b: Sorry ,I won’t do that again
C．a: Excuse me, please speak in a low voice.b: I’m sorry for that. I won’t do that again.
The windows must _________ before you leave the room.
| A．be closed | B．are closed | C．close | D．be close |
I am very sad that I ______ many chances in the last few years.
| A．miss | B．missed | C．have missed | D．am missing |
—Must we clean the classroom now?
—No ,you _______.
| A．must | B．needn’t | C．aren’t | D．mustn’t |
—____________?
—Very well, thanks.
| A．How are you |
| B．How do you do |
| C．Where are you |
| D．What are you doing |
Scientists can make the robots __________.
| A．to dance | B．dance | C．dancing | D．danced |