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
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26.________ the investigation, the committee published the report on the cause of the accident.
A. Completed
B. Completing
C. Having completed
D. To have completed
27.The report shows that over half of the women are suffering ________ second-hand smoke at the workplace.
A. in
B. for
C. on
D. from
28.Our goal is to fulfill the needs of our clients, ________ challenging they may be.
A. however
B. whenever
C. wherever
D. whatever
29.Only after the secretary saw the train disappear in sight ________ the railway station.
A. he leaves
B. has he left
C. he left
D. did he leave