Claire's car wasn't there, so she ______ have gone to her mother's.
A. would B. should
C. can D. must
What’s strange is that through the middle of the building ______.
A. lies a light railway B. does lie a light railway
C. a light railway lies D. does a light railway lie
After the long journey, the three of them went back home, ＿＿＿＿＿＿ .
A. hungry and tiredly B. hungry and tired
C. hungrily and tiredly D. hungrily and tired
It ______ him over 10 years to work on his one-man helicopter and at last he succeeded.
A. spent B. cost
C. took D. paid
Investors are also concerned that once the economy improves, people might lose ______ interest in further education.
A. 不填 B. a
C. an D. the
It won’t be long ______ self-driving cars appear on the market.
A. until B. after
C. when D. before
