You’d better go there by train. The train ticket is __________the airplane ticket.
| A．as cheap three times as | B．as three times cheap as |
| C．three times cheaper than | D．cheaper three times than |
My chest __________ when I make a deep breath, doctor.
| A．harms | B．wounds | C．hurts | D．injures |
The plane, __________ by another plane, broke into pieces.
| A．crashed | B．to crash |
| C．to be crashing | D．have crashed |
It worries me the way he keeps __________ his mind.
| A．changed | B．changing |
| C．to change | D．being changed |
His newly built cafe, the walls of which are painted light green, is really a __________ place for us, especially after hard work.
| A．hopeful | B．thoughtful | C．peaceful | D．cheerful |
Darwin counted 225 flowering plants, __________ he collected and brought home 193.
| A．which | B．for which | C．in which | D．of which |