We should all remember that some great scientific discoveries _____________ by chance.
| A．gained | B．discovered | C．occurred | D．earned |
When we got to the cinema, there were no tickets left. We should have booked.
| A．in the end | B．in advance |
| C．before long | D．long before |
—What do you think of your part-time job in the summer vacation?
—Well, the work is, but I feel happy when I can make money using my hands.
| A．tired | B．tire |
| C．tiring | D．to be tiring |
If men can’t live in harmonynature, the balance will be destroyed.
| A．to | B．with | C．of | D．for |
We should dowe can to help those who lost their homes in the heaviest rain.
| A．whatever | B．however | C．which | D．that |
Why not ride bicycles tothe countryside with us this weekend? I’m sure you will enjoy yourself and come across the unexpected things.
| A．search | B．discover | C．explore | D．desert |