However you do, you must keep in mind what your parents told you before you left home .
A. However
B. keep in mind
C. what
D. left home

From the chart shown on page 15, one can easily see how large each county is and how many inhabitants does it have.
A. shown
B. one can
C. how large
D. does it have

Dorothea Dix, was known for her work to improve mental institutions, served as superintendent of nurses during the American Civil War.
A. was known
B. to improve
C. served
D. nurses

You must be aware of that what you are doing is quite illegal.
A. must be
B. of that
C. what
D. is

It is imperative that he will be taken to hospital at once.
A. imperative
B. will be taken
C. to
D. hospital

The teacher"s lecture on the past participle was three hours long and Conrad felt very boring .
A. teacher"s
B. on
C. was
D. boring

His recommendation that the Air Force investigates the UFO sighting was approved by the commission and referred to the appropriate committee.
A. investigates
B. was
C. by the commission
D. referred

He gave orders that the horses were made ready at once as he was pressed for time.
A. the horses
B. were
C. as
D. was pressed

It was suggested that Pedro studies the material more thoroughly before passing the exam.
A. was
B. studies
C. more thoroughly
D. passing

The piano teacher requires that her student practices at least forty-five minutes every day in preparation for next week"s recital( n . 小型音乐会).
A. that
B. practices
C. forty-five minutes
D. in preparation