It’s 10 o’clock now. I must go.—It’s raining outside. Don’t leave ________ it stops. [ ]

While she was trying to pass a truck before her, she __________ another car coming.

A set of keys _____ on the table. Can you see _____ .

A very beautiful scene spreads in front of the mountain, at the foot of which ______.

I found ___________ hard to remember all the twelve star signs because they are difficult to pronounce(发音) and spell.