The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.
| A．what | B．which | C．that | D．though |
Is your ring _____ gold?
| A．real | B．true | C．actual | D．factual |
He has a _______ knowledge of animals.
| A．brief | B．folk | C．flat | D．broad |
You’d better put the milk in the fridge, which has a _______ to go bad in hot weather.
| A．currency | B．tendency | C．trend | D．way |
The Browns stood staring at the happy _______ of children playing in the park.
| A．scene | B．landscape | C．scenery | D．view |
There are a number of words in the English language that were French in ______.
| A．root | B．base | C．bottom | D．origin |