the plane.
| A．Flew down |
| B．Down flew |
| C．Down was flying |
| D．Down fly |
Don’t you think the world would be an easier place to live in, if we all ________ the same language?
| A．speak | B．had spoken |
| C．spoke | D．would speak |
Knowing ________ you’re good at and doing even more of it creates excellence.
| A．where | B．which | C．what | D．that |
It is a wise father ________ knows his child.
| A．that | B．which | C．what | D．whom |
—May I smoke here?
—Choose a seat in the smoking section, if you ________.
| A．should | B．must | C．can | D．may |
________ unusual, this is not the first time the government has chosen to take control of large companies.
| A．Since | B．When | C．Because | D．While |