This is the third time I __________ the Great Wall.
The man we followed suddenly stopped ad looked as if________ whether he was going I the right direction.
—Would you rather come on Friday or Saturday? —________.
—Did you look up the time of trains to Shanghai? —Yes, the earliest train is________ to leave at 5:30 am.
She stepped into the bedroom quietly_______ she might wake up her roommates.
Many people have been ill from a strange disease these days,________ we’ve never heard of before.