If the new safety system _______ to use, the accident would never have happened.
A. |
had been put |
B. |
were put |
C. |
should be put |
D. |
would be put |
People______better access to health care than they used to,and they're living longer as result.
A. |
will have |
B. |
have |
C. |
had |
D. |
had had |
Jim has retired, but he still remember the happy time _______ with his students.
A. |
to spend |
B. |
spend |
C. |
spending |
D. |
spent |
The little problems ______ we meet in our daily lives may be inspirations for great inventions.
A. |
that |
B. |
as |
C. |
where |
D. |
when |
The national park has a large collection of wildlife, _________ from butterflies to elephants.
A. |
ranging |
B. |
range |
C. |
to range |
D. |
ranged |
In the 1950s in the USA, most families had just one phone at home, and wireless phones _______ yet.
A. |
haven't invented |
B. |
haven't been invented |
C. |
hadn't invented |
D. |
hadn't been invented |
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 |
Every year, ______ makes the most beautiful kite will win a prize in the Kite Festival.
A. |
whatever |
B. |
whoever |
C. |
whomever |
D. |
whichever |
-Peter, please send us postcards ______ we'll know where you have visited.
-No problem.
A. |
but |
B. |
or |
C. |
for |
D. |
so |
Samuel, the tallest boy in our class, ______ easily reach the books on the top shelf.
A. |
must |
B. |
should |
C. |
can |
D. |
need |