by keeping down costs will Power Data hold its advantage over other companies.
A．Only B．Just
C．Still D．Yet
We’re trying to ring you back, Bryan, but we think we your number incorrectly.
A．looked up B．took down
C．worked out D．brought about
The company had about 20 notebook computers but only one-third used regularly. Now we have 60 working all day long.
A．is B．are
C．was D．were
This machine . It hasn’t worked for years.
A．didn’t work B．wasn’t working
C．doesn’t work D．isn’t working
When different cultures, we often pay attention only to the differences without noticing the many similarities.
A．compared B．being compared
C．comparing D．having compared
is our belief that improvements in health care will lead to a stronger, more prosperous economy.
A．As B．That
C．This D．It
