.
. All books ___________ to the library more than three days late will be subject to a fine.
| A．return | B．returning | C．to return | D．returned |
Don’t promise anything ______ you are one hundred percent sure.
| A．whether | B．after | C．how | D．unless |
Dogs have a very good ______ of smell and are often used to search for survivors in an earthquake.
| A．sense | B．view | C．means | D．idea |
American Indian ______ about five percent of the U.S. population.
| A．fill up | B．bring up | C．make up | D．set up |
There are plenty of jobs ______ in the western part of the country.
| A．present | B．available | C．precious | D．convenient |
–I’d like some more cheese.
–Sorry, there’s ______ left.
| A．some | B．none | C．a little | D．few |