—Ready to quit guessing, Sandy?—No, no, I hold on! I think I ________ to the answer.[ ]

Researchers claim to have found the first proof _______ getting a regular eight hours a night really does make you appear healthier and more attractive

Did your father come back early last night?—Yes. It was not yet eight o’clock _______ he arrived home.

Never before ________ seen anybody who can play tennis as well as Robert.(2012·江西)

My brother likes eating very much but he isn’t very _____ about the food he eats.