24.The old man was shocked to learn that his illness could result in death if ____ untreated.
A) to leave
B) to be left
C) leaving
D) left
25.Our teacher recommend that we ____ as attentive as possible when we visit the museum.
A) are
B) be
C) were
D) shall be
26.The old man came upstairs with great strength , his right hand ____ a stick for support.
A) held
B) holding
C) being holding
D) was holding
27.My wife said in her letter that she would appreciate ____ from you sometime.
A) hearing B) to hear C) having heard D) to have heard
28.It ____ around nine o'clock when I drove back home because it was already dark.
A) had to be B) was to be
C) must be D) must have been
29.If you act ____ the doctor's advice ,you won't get well again.
A) aside from B) contrary to C)capable of D) prior to
30.Visitors coming for short periods of time do not always experience ____ intense emotions ____ visitors who live in foreign countries for longer terms.
A) the same … as
B) both … and
C) either... or
D) so … that
31.Urban mothers had difficulty ____ their children into child care facilities.
A) get
B) to get
C) in getting
D) for getting
32.If it ____ too much trouble, I'd love a cup of tea.
A) isn't
B) wasn't
C) weren't
D) hadn't been
33.The population of many Alaskan cities has ____ doubled in the past three years.
A)larger than
B)as great as
C)more than
D)as many as
34.All that can be done ____.
A)have been done
B)have done
C)has done
D)has been done
35.A person beating a drum or blowing a trumpet causes vibrations in the air ____ sound waves.
A) calls
B) called
C) is called
D) are called
36.These national parks are very important for preserving many animals, who would ____ run the risk of becoming extinct.
A) otherwise
B) nevertheless
C) therefore
D) instead