This disaster ______ that people had no knowledge of first aid and they hadn’t known how to protect them-selves in face of danger.
| A．led to | B．contributed to | C．resulted in | D．lay in |
His wife was busy cooking while he watched TV ________ comfortably in the sofa.
| A．seat | B．to seat | C．seating | D．seated |
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 |