__________knowledge comes from practice is known to all.
| A．If | B．What | C．Where | D．That |
Once______ a difficult and even dangerous place______，Vietnam is now a friendly destination that welcomes visitors from all over the world.
| A．considered; visiting | B．considered; to visit |
| C．considering; visiting | D．considering; to visit |
-----Do you think we should accept that offer?
-----Yes, we should, for we such bad luck up till now, and time_________ out.
| A．have had; is running | B．had; is running |
| C．have; has been run | D．have had; has been run |
Don't just wait．You should try to seek for information you need.
| A．to inform | B．to be informed | C．for informing | D．for being informed |
Would it be for you to pick me up at four o' clock and take me to the airport?
| A．arbitrary | B．vacant | C．compulsory | D．convenient |
I like this jacket better than that one, but it costs almost three times．
| A．as much | B．as many | C．so much | D．so many |