. Living in the western part of the country has its problems, ________ obtaining fresh water is not the least.
| A．with which | B．for which | C．of which | D．which |
Running a company is not ______ a matter of hiring people — they also need to be trained.
| A．simply | B．partly | C．seriously | D．equally |
Everything was perfect for the picnic ______ the weather.
| A．in place of | B．as well as | C．except for | D．in case of |
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 |