Smile to the world, _______ the world will smile back to you.
| A．nor | B．but | C．or | D．and |
—What about doing__________for the homeless people?
—Good idea!
| A．anything helpful | B．something helpfull |
| C．helpful anything | D．helpful something |
---What does Tu Youyou do?
---She has ___________ a scientist for over thirty years.
A. played for B. worked as C. stayed with
This kind of magazine _________ well in the store. If you want to buy one, you must go there early.
A. sounds B. watches C. sells
Some precious(珍贵的) animals ____________ because of people’s killing.
A. died from B. put out C. died out
To ______________something is to produce or design it that has not existed before.
A. invent B. discover C. Find