It wasn’t _______ he took off her mask _______ I recognized he should be a famous film star.

Failure can make a positive contribution to your life _______ you learn to use it

―It’s snowing outside. Why not ____________ it.―Good idea!

Is that Jack speaking—Sorry, he isn’t in right now. He ______ the cinemawith his aunt.

____ you know your potential（潜力）, you have to rely on many other people to get to where you are