With the development of science and technology, people’s life _______ in the past few years.
| A．improved | B．has improved |
| C．is improving | D．had improved |
Better go to see my sick colleague right now, ________I?
| A．hadn’t | B．didn’t | C．don’t | D．won’t |
I promised to get there before 5 o’clock, but now the rain is pouring down. They ______ for me impatiently.
| A．may wait | B．ought to wait | C．could wait | D．must be waiting |
She’s already an hour late, What _____to her?A can have happened B may happenC should have happened D may have happened
As it tuned out to be a small house party, we ____ so formally.
| A．needn’t dress up | B．couldn’t have dressed up |
C．didn’t need dress up | D．needn’t have dressed up |
— The woman biologist stayed in Africa studying wild animals for 13 years before she returned. — Oh, dear! She ______ a lot of difficulties!
| A．may go through | B．might go through |
C．ought to have gone through | D．must have gone through |