A great hall has _________ in order to ease the problem of dining congestion(拥堵) in our school.
The numbers that researchers get from the experiments can be _______, just like number puzzles.
_______ the house is empty, memories flood my mind of a time when it was filled with life.
By the time a child is five, he _______ hundreds of hours of television.
There is nothing wrong with using a credit card for purchases. It’s more _______ than carrying loads of cash.
If not _______, you’re allowed to return everything within 10 days for a full refund and no further duties.