Mary is a warm-hearted lady. She is ready to help others, but never expects anything .
| A．in trouble | B．in charge |
| C．in peace | D．in return |
— Excuse me．Is this the right way to the Summer Palace?
— Sorry, I am not sure．But it______be.
| A．might | B．will | C．must | D．can |
— Do you want tea or coffee?
— ______．I really don’t mind.
| A．Both | B．None | C．Either | D．Neither |
Finally they arrived at a place _____ sold cigarettes and some other bargains.
| A．where | B．which | C．from which | D．what |
Don’t be worried about his safety．______, he is an eighteen-year-old young man.
| A．In all | B．After all | C．Above all | D．First of all |
More bison were killed．The bison population is thought ______ from 60 million to just a few hundred between 1850 and 1910.
| A．to have fallen | B．having fallen |
| C．to fall | D．falling |