________ people go abroad, they have to bring their passports with them.
| A．Until | B．When |
| C．Because | D．Before |
It is said that the meeting _______ for a week.
| A．has been ended | B．has lasted |
| C．has began | D．has been held |
--I hear this kind of CD-ROM is very popular.
--Let’s buy one before it ____________.
| A．is come out | B．comes out | C．sells out | D．is sold out |
This problem is ______ difficult __________.
| A．so; that few of us can do |
| B．so; that few of us can do it |
| C．too; for anyone of us to do |
| D．too; for anyone of us to do it |
_____ hard work it is! But _____ fun it is to finish walking the trail.
| A．What; how | B．What; what |
| C．How; how | D．How; what |
The life we were used to ________ greatly since 2002
| A．change | B．changing | C．have changed | D．has changed |