The tower on the top of the hill _______ the beauty of the lake.
A, adds up to B. adds to C. adds up D. adds
We _____ on this project for four hours． Let’s have a rest．
| A．are working | B．have been working |
| C．worked | D．had worked |
Would it be ______ for you to pick me up at four o’clock and take me to the airport?
| A．free | B．vacant |
| C．handy | D．convenient |
I would rather you did some reading while you are free, but you ______．
| A．don’t | B．didn’t |
| C．wouldn’t | D．weren’t |
I don’t think ___ possible to travel around the world without any modern equipment．
| A．this | B．that |
| C．its | D．it |
I have a ______ to talk too much when I’m nervous．
| A．meditation | B．tendency |
| C．reckon | D．expedition |