Passengers are required to _____ seated until the plane comes to a complete stop.
| A．leave | B．get | C．keep | D．remain |
Though tigers are ______ to people, they are ______ now and we should protect them or they will die out.
| A．dangerous ; dangerous | B．in danger ; in danger |
| C．dangerous ; in danger | D．in danger ; dangerous |
Some passengers were ______ in the traffic accident and taken to the nearest hospital.
| A．injured | B．damaged | C．destroyed | D．harmed |
It was along the Mississippi River _____ Mark Twain spent much of his childhood.
| A．how | B．which | C．that | D．where |
The house they are living now is ______ our house.
| A．twice the size as | B．the size twice of |
| C．twice as the size of | D．twice the size of |
Milu deer，which used to be ______ in China long ago，is a rare animal nowadays.
| A．ordinary | B．common | C．popular | D．usual |