.________they were singing, the teacher came in.
| A．Before | B．after | C．As | D．Until |
In face of danger, we need to stay _______. Only in this way can we come up with good solutions.
| A．still | B．quiet | C．calm | D．silent |
— What about ______ bike?
— Do you think it all right to buy him that bike as ______ birthday gift?
| A．a; a | B．the; a | C．a; / | D．the; / |
－Would you like to go the hospital to help the sick kids this Sunday?
－________. I’ll be free then.
| A．Sorry, I can’t | B．Not at all |
| C．Thank you | D．Sure, I’d love to |
－Can you tell me _______ to travel to Dalian?
－About two hours by plane.
| A．how much it costs | B．what I should take |
| C．how long it takes | D．which is the best season |
Frank lives a simple life ________ he has lots of money.
| A．although | B．because | C．so | D．if |