Scientists across the world agree that this is an invention of _______ great significance, _______ invention that will greatly change human life.
#9551
A
a; the
B
a; an
C
/ ; the
D
/ ; an
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—My son is lost . Have you seen a boy passing by here?—I saw boy hidden behind tree over there . You may go and have a look.
#10022
A
a; the
B
the; the
C
a; a
D
the; a
We set off early ____ next morning and came to ____ unknown valley after about an hour.
#9918
A
the; the
B
the; an
C
/; a
D
/; the
—Do you know whether they talked about their work or their family?—As matter of fact，I couldn’t hear it clearly, as they talked in whisper．
#9226
A
the，a
B
the，the
C
a；a
D
a：the
The young man is ______ Edison in our factory and he has made ______ number of important inventions over the years.
#9644
A
an; the
B
an; a
C
\; the
D
\; a