I ________ on a sofa because my grandparents have been here to spend the weekend.
| A．slept | B．was sleeping | C．have slept | D．am sleeping |
Anyone ________ bags, boxes, or whatever, was stopped by the police．
| A．seen carry | B．seen carrying | C．saw to carry | D．saw carrying |
The great millionaire gave away all his fortune to the charity and lived a simple life，________.
| A．happy and content | B．happily and content | C．happily and peaceful | D．happy and peace |
While dancing happily at home,_______________ ．
| A．the door bell rang | B．the door bell rings |
| C．we heard the door bell rings | D．we heard the door bell ring |
Some people argue using ____________ nature to meet our own needs may spell disaster, unless we start to look around and understand how _________ clean environment benefits us all.
| A．/; a | B．the; the | C．the; a | D．a; a |
－Do you mind if I keep pets in this building ? －_____________________.
| A．Of course not. It’s not allowed here | B． I’d rather you didn’t, actually. |
| C．Great! I love pets | D．No, you can’t. |