11________ is estimated that 25 million school lunches are sold each day.
A.It
B.That
C.This
D.As
开始考试练习点击查看答案12You shouldn"t take _____ for granted that your parents care much about you and do so much for you.
A.it
B.that
C.this
D.one
开始考试练习点击查看答案13He didn"t make ________ clear when and where the meeting would be held. [ ]
A.this
B.that
C.it
D.these
开始考试练习点击查看答案14When you go outing with your sisters, you must see to ________ that they are safe.
A.everything
B.it
C.them
D.yourself
开始考试练习点击查看答案15He didn"t make clear when and where the meeting would be held.
A.this
B.that
C.it
D.these
开始考试练习点击查看答案16If I can help________, I don"t like working too late into the night.
A.so
B.that
C.it
D.them
开始考试练习点击查看答案17He knows that ________ is time that he ________.
A.it; quits smoking
B.it; quitted smoking
C.this; should quit to smoke
D.that; quitted to smoke
开始考试练习点击查看答案18I"d appreciate ________ if you would like to teach me how to use the computer.
A.that
B.it
C.this
D.you
开始考试练习点击查看答案19The fire made ______ difficult to rescue the people trapped under the ruins in the earthquake.
A./
B.this
C.that
D.it
开始考试练习点击查看答案20They make________a rule not to watch TV during the meal.
A.one
B.it
C.its
D.that
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