______ some teenagers don’t realize is ________ difficult life can be after they get addicted to drugs.
| A．What; how | B．That; how | C．That; what | D．What; what a |
I don't know who invented ________ iphone，but I think it is ________ useful invention.
| A．the；a | B．the；the | C．an；the | D．an；a |
—Which of the twin brothers is easier to get on with?
—________ younger one.He is ________ most humorous man.
| A．A；a | B．A；the | C．The；a | D．The；/ |
It is said that ________ wool produced in Australia is of ________ high quality.
| A．/；/ | B．the；/ | C．the；a | D．the；the |
— How did you do in your essay?
—I got ________ okay grade，but Mr.Jones gave Sarah top marks.She's ________ teacher's pet，you know.
| A．/；a | B．an；/ | C．/；the | D．an；a |
My friend's birthday is coming soon.I would like to go to ________ store，or some places close by to buy him ________ present.
| A．the；the | B．a；the | C．/；a | D．the；a |