Which of the following is difficult for robots to do at present
A. To assemble machines.
B. To do some kinds of cleaning.
C. To work as service men.
D. To tell that the corner where walls and ceilings meet goes in, not out.
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I prefer singing ______ drawing.
A. to
B. for
C. than
D. that
"He closed his ears to the sound of the lunch bell," means ______.
A. he did not hear the lunch bell.
B. he heard the lunch bell but didn't go for lunch
C. he put something in his ear to close them
D. he did not know it was the lunch bell
The traveler thought that he ______.
A. would find no food served on board
B. could not get home without having meals on board
C. could do without any food before he got home
D. would not be allowed to eat on board
Hardly ______ when the accident happened.
A. he had gone
B. had he gone
C. he went
D. he has gone
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