[填空题]Not ______ (know) how to do the math problem, she came to ask her brother.

[填空题]Not（）(know) how to do the math problem, she came to ask her brother.

[填空题]Not ______ (.know) how to do the math problem, she came to ask her brother.

[单项选择]How she wishes she （　） more attention to her lessons when she was at school!
A. have paid
B. paid
C. had paid
D. has paid

[单项选择]How she wishes she（）more attention to her lessons when she was at school!
A. have paid
B. paid
C. had paid
D. has paid

[单项选择]How she wishes she ______ more attention to her lessons when she was at school!
A. have paid
B. paid
C. had paid
D. has paid

[填空题]Scientists working on a problem do not know and sometimes can’t even guess what the final result will be. Late on Friday, 8 November, 1895, Professor Rontgen, a German physicist, was doing an experiment in his laboratory when he noticed something extraordinary. He had covered an electric bulb with black cardboard, and when he switched on the current he saw little dancing lights on his table. (46) ; how then could any ray penetrate On the table there were some pieces of paper which had been covered with metal salts. (47) . Professor Rontgen took a piece of this paper and held it at a distance from the lamp. Between it and the lamp he placed a variety of objects, a books, a pack of cards, a piece of wood and a door key. The ray penetrated every one of them except the key. He called his wife into the laboratory and asked her to hold her hand between the lamp and a photographic plate. (48) , but she held up her hand for a quarter of an hour, and when the plate was deve

[单项选择]She is so______, it is inconceivable how she is generally thought to be______.
A. percipient… reasonable
B. philanthropic … dogmatic
C. importunate … fortunate
D. inconsistent … catholic
E. self-aggrandizing … unassuming