A good teacher must be able to hold his students’ attention ____ he reaches the end of the class.
| A．when | B．after | C．until | D．unless |
Studies show that Americans chat on their phones for more than five hours a month, _____ Europeans.
| A．as much as twice | B．twice as much as |
| C．as much twice as | D．as twice much as |
--- I hope you enjoyed the film last night.
-----How on earth do you know I went to a film? I ________ you.
| A．won’t tell | B．didn’t tell | C．haven’t told | D．hadn’t told |
This machine is very easy. Anybody can learn to use it in a few minutes.
| A．operating | B．to be operating | C．operated | D．to operate |
My sister met him at the cinema yesterday afternoon, so heyour lecture.
| A．couldn’t have attended | B．needn’t have attended |
| C．mustn’t have attended | D．shouldn’t have attended |
