No matter how __________ she brushed the old pot, she could not make it completely clean, which made her very upset.
| A．roughly | B．occasionally |
| C．instantly | D．thoroughly |
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 |
Some tourists think that the beauty of mountains is greater than ______ of deserts.
| A．one | B．those | C．the one | D．that |