Doris' success lies in the fact _________ she is co-operative and eager to learn from others.
| A．which | B．that | C．when | D．Why |
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 |
People work through problems in ways ________ they are unaware.
| A．of which | B．in which |
| C．on which | D．to which |