21.The company has decided to sponsor the exhibition, _________ helps to promote its image.
A. that
B. who
C. what
D. which
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22.The newly appointed manager is said to be neither flexible ________ easy to get along with.
A. or
B. and
C. nor
D. but
23. ________ salaries may not be high, working as a nursing assistant does have some other benefits.
A. Unless
B. While
C. As
D. Since
24.How we pack theproducts has a significant impact ________ the cost of logistics.
A. of
B. on
C. with
D. to
25.________ impressed me most about the school is how it was designed to support both the students and the community.
A. What
B. That
C. This
D. Which