I just don’t understand ____that leads to so many teenagers becoming addicted to playing computer games.
| A．why it does | B．what it does |
| C．what it is | D．why it is |
It is said that ____ wool produced in Australia is of ____ high quality.
| A．/ ; / | B．the ; / | C．the ; a | D．the ; the |
—Well,it’s getting late.I must be going.Thank you for inviting me to your birthday party.
—______.
| A．Oh,it’s so late | B．Thank you for coming |
| C．All right | D．I really had a happy time |
Now young people like to go to the fast-food restaurant,____ ,as the name says,eating doesn’t take much time.
| A．which | B．that | C．what | D．where |
What a great artist! It seemed only a couple of minutes ____ he had finished this wonderful painting!
| A．until | B．when | C．after | D．before |
I don’t remember how many years ago____ State Street began its business in China.
| A．it was when | B．it was that |
| C．was it when | D．was it that |