The development of industry has been_______ gradual process throughout _______ human existence, from stone tools to modern technology.
| A．不填, the | B．the; a | C．a; 不填 | D．a; a |
The boss went into the house ,the five boys in the rain .
| A．left ;standing | B．leaving ; standing | C．left; stand | D．leaving ; stand |
This is the small house less than 15 square meters, under ______ roof lives a large family of three generations.
| A．which | B．that | C．its | D．whose |
Since then the number of people taking driving lessons ________ 20％.
| A．has increased to | B．increases by | C．has increased by | D．have increased by |
To understand the grammar of the sentence, you must break it ____ into parts.
| A．down | B．up | C．off | D．out |
The whole class________ the teacher attentively.
| A．are listening to | B．is listening to |
| C．are listening | D．is listening |