We first met on a train in 2000. We both felt immediately that we ______ each other for years.
| A．knew | B．have known | C．have known | D．know |
There are so many books!It is not easy for us to decide what to take and what to______.
| A．take on | B．pick up |
| C．leave behind | D．work out |
A model or an experiment in a science class can help students see things which would ______ remain hidden.
| A．otherwise | B．still | C．thus | D．therefore |
How to balance the government's budget without raising taxes is a ______problem.
| A．firm | B．tough | C．secure | D．stable |
On your way to New York William will keep you ______if you don't want to be lonely.
| A．company | B．companion | C．safety | D．friend |
Don't ______.You will ______ new customs and different ways of thinking.
| A．lose your heart；apply to |
| B．lost heart；apply yourself to |
| C．lose your heart；adapt to |
| D．lose heart；adapt yourself to |