Mr. White, along with his assistants, ______ on the project day and night to meet the deadline(最后期限).
| A．work | B．working | C．is working | D．are working |
---Do you know who invented ________ telephone?
---No. But it is really________ most important invention.
| A．/; the | B．the ;/ | C．/ ;a | D．the ;a |
—— I’m thinking of tomorrow’s math test. I’m afraid I can’t pass it.
——______. I’m sure you’ll make it.
| A．Without a doubt | B．Good luck | C．Indeed | D．Cheer up |
Many died from the diseases ______by the Europeans.
| A．bring | B．to bring | C．brought | D．were brought |
There is also a fierce debate over the question ______ human cloning experiments should be allowed.
| A．that | B．what | C．which | D．whether |
Scientists still wonder whether cloning will help or harm us and where it ____ us.
| A．has led | B．is leading | C．had led | D．would lead |