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 he your lecture.
A．couldn’t have attended B．needn’t have attended
C．mustn’t have attended D．shouldn’t have attended
_____ many times, he finally understood it.
A．Told B．Telling C．Having told D．Having been told
