In today's information age, the loss of data _________ cause serious problems for a company.
| A． |
need |
B． |
should |
C． |
can |
D． |
must |
If you don't understand something, you may research, study, and talk to other people _______ you figure it out.
| A． |
because |
B． |
though |
C． |
until |
D． |
since |
Many airlines now allow passengers to print their boarding passes online ______ their valuable time.
| A． |
save |
B． |
saving |
| C． |
to save |
D． |
saved |
Jane moved aimlessly down the tree-lined street, not knowing ______she was heading.
| A． |
why |
B． |
where |
C． |
how |
D． |
when |
______ birds use their feathers for flight, some of their feathers are for other purposes.
| A． |
Once |
B． |
If |
C． |
Although |
D． |
Because |
-______ that company to see how they think of our product yesterday?
-Yes. They are happy with it.
| A． |
Did you call |
B． |
Have you called |
C． |
Will you call |
D． |
Were you calling |