—James didn’t turn up last night, did he?
—No. He _________.we had changed our plan.
| A．shouldn’t have come | B．needn’t have come |
| C．didn’t need to come | D．needn’t come |
He sat at the desk, __________ a novel.
| A．read | B．to read | C．reading | D．Reads |
Great changes _______ in China in the past 20 years.
| A．took place | B．have taken place |
| C．were taken place | D．have been taken place |
The world today _____ different without the amazing discoveries produced by great scientists.
| A．were | B．had been | C．would be | D．would have been |
I was surprised to find the snack shops around the school empty; the students everything!
| A．had been buying | B．had bought |
| C．have bought | D．have been buying |
The driver suggested that we set out before seven in the morning in order to avoid traffic jams.
| A．should | B．might | C．could | D．would |