Not until the early years of 19th century_______ what heat is.
A. man did know
B. man know
C. didn't man no
D. did man know
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Hardly _______when_________ to visit her.
A. had she gone out, a student came
B. had she gone out, did a student come
C. had gone out she, did a student come
D. had she gone out, came a student
—Tom forgets his purse when he went out.—Good heavens,______.
A. so did I
B. so I did
C. I did so
D. I so did
Never _________such a tall building.
A. I have seen
B. have I seen
C. I see
D. did I see
I vain _____to open the locked door.
A. he tried
B. did he try
C. he tries
D. does he try
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