— You seem familiar with Mr. John?
—Of course, we _________ together for three years in the 1990s.
| A．have worked | B．were working | C．are working | D．worked |
---I have trouble _____ my new computer.
-----Don’t worry. I’ll show you how ____it.
| A．using, using | B．to use, to use |
| C．using, to use | D．to use, using |
The math problem is so hard, I really don’t know _____.
| A．how to do it | B．how to do |
| C．what to do it | D．when to do |
--- Shall we call a taxi?
---- Ok, Let me ______ the phone number in Yellow Pages.
| A．look at | B．look for |
| C．look up | D．look after |
_____ there may be sharks near the beach, people still swim there.
| A．Since | B．But | C．As | D．Although |
The school isn’t far ________ my home. It’s just ten minutes’ walk.
| A．out | B．off | C．at | D．from |