________ we know, the moon goes around the sun.
hard you try, it is difficult to lose weight without cutting down the amount you eat.
The lecture,at 7:00 pm laze night, was followed by an observation of the moon with telescopes.
It was not until I came here _____I realized this place was famous for not only its beauty but also its weather.
Sorry, I am too busy now. If Itime, I would certainly go for an outing with you.
_____I always felt I would pass the exam, I never thought I would get an A.A. While B. Once C. If D. Until