I won’t tell the student the answer to the math problem until he on it for more than an hour.
| A．has been working | B．will have worked |
| C．will have been working | D．had worked |
——Excuse me, I want to have my watch fixed, but I can’t find a repair shop.
——I know nearby. Come on, I’ll show you.
| A．one | B．it | C．some | D．that |
Is ________ man’s ability to reason that sets him apart from other animals?
| A．one | B．this | C．it | D． / |
--- Can I help you ?
--- I’d like to buy a present for my best friend, _______at proper price but of great use.
| A．that | B．one | C．it | D．this |
I found ______ possible to answer all the questions within the given time.
| A．that | B．it | C．this | D．what |
——Have you any money on you? I need some badly.
——Sorry, but ______ at all .
| A．not | B．nothing | C．none | D．quite a little |