I lost my key. Please call me ______ 678-5678.
---Could you tell me _______yesterday?--- Because my bike was broken on my way here.
__regular exercise is very important, it’s not a good idea to exercise too close to bedtime.
It was a very long day for Jack. He didn’t get home from school ______ six o’clock.
Sorry, Madam. You’d better come tomorrow because it’s ________ the visiting hours.
—What’s the low-carbon(低碳的) lifestyle like? —Save energy, and produce carbon.