The biggest problem for most plants, which ______ just get up and run away when threatened, is that animals like to eat them.
| A．can’t | B．shan’t | C．needn’t | D．mustn’t |
Our English teacher, having explained to us how to design a project, allowed us a whole week’s preparation and then the class.
| A．to dismiss | B．dismissed | C．dismissing | D．having dismissed. |
We have decided to fulfill the task in time, difficulties we may meet with.
| A．no matter how | B．however | C．whatever | D．whichever |
My parents don’t think I should take a course on law, yet I am determined to take .
| A．it | B．one | C．that | D．the one |
Please do me a favor, —the box upstairs.
| A．carry | B．to carry | C．carrying | D．having carried |
We know that the Black Sea, one thousand years ago, was a fresh water lake about ________ and unconnected with the Mediterranean.
| A．its two thirds present size | B．two-thirds size of the present |
| C．its two-thirds of the present size | D．two- thirds its present size |