---- What are you going to do this weekend ?
---- I'm going to do some outdoor activities _______ it rains .
A. If B. unless C. because
---Could you tell me _______yesterday?
--- Because my bike was broken on my way here.
| A．why you came late | B．why do you come late |
| C．why you come late | D．why did you come late |
______ regular exercise is very important, it’s not a good idea to exercise too close to bedtime.
| A．If | B．As | C．Although | D．Unless |
It was a very long day for Jack. He didn’t get home from school ______ six o’clock.
| A．since | B．to | C．by | D．until |
Sorry, Madam. You’d better come tomorrow because it’s ________ the visiting hours.
| A．during | B．at | C．before | D．beyond |
—What’s the low-carbon(低碳的) lifestyle like?
—Save energy, and produce carbon.
| A．more; more | B．less; more |
| C．less; less | D．more; less |