Well, you can buy $20 tickets or 30 $ tickets, ______ you prefer.
---Could it be the restaurant_____ you had dinner with me yesterday ______ you left your keys?
It was five hours _____ the French climber reached the top of the world’s tallest building.
He must have been annoyed by something yesterday, _____?
Children _____ to difficult situations are better at handling those _____ tasks.
---Are you happy with this lab? ---Not a little. We can’t have _______.