He seemed as if he ___ his homework when his mother came in.
| A．did | B．is to be doing | C．were doing | D．be doing |
I’m sorry I didn’t phone you, but I’ve been very busy ___ the past couple of weeks.
| A．beyond | B．with | C．among | D．over |
The two girls are so alike that strangers find ____ difficult to tell one from the other.
| A．it | B．them | C．her | D．that |
It ___ be the postman at the door. It’s only six o’clock.
| A．mustn’t | B．can’t | C．won’t | D．needn’t |
She has already tried her best. Please don’t be too ____ about her job.
| A．special | B．responsible | C．unusual | D．particular |
In the last few years thousands of films ____ all over the world.
| A．have produced | B．have been produced |
| C．are producing | D．are being produced |