1 . When a Costco customer walks in the door, he or she expects that the products will   be                       high quality and offered at a low price.

A．to

B．of

C．at

D．about

2 . Sometimes I feet hungry_______ meals, so I eat an apple or a pear.

A．between

B．among

C．at

D．under

3 . Almost all the people present were touched                  words after hearing his moving story.

A．within

B．upon

C．at

D．beyond

4 . —When did it begin to snow?
—It started________the night.

A．during

B．by

C．from

D．at

5 . Not much impressed ________ the performance, half the audience left before it was over.

A．on

B．in

C．by

D．at