Professor Tu Youyou never stops doing research on Chinese medicine，______？（ ）
| A． |
is she |
B． |
does she |
| C． |
isn't she |
D． |
doesn't she |
Our city is cleaner than it______be．（ ）
A．is used toB．used toC．uses toD．is used
After two years' physical training， he was____and healthier．（ ）
A．weakerB．longerC．strongerD．shorter
The number"23，456" can be read as "_____"．（ ）
A．twenty﹣three thousand， four hundred and fifty﹣six
B．twenty﹣three thousand and four hundred fifty﹣six
C．two three thousand and four five six
D．two three thousand， four and five six
﹣I can't find my English textbook．
﹣Is it possible that you _____ it at home？（ ）
A．lostB．sawC．leftD．gave
What lovely flowers! Could you please tell me______？（ ）
A．why did you get them
B．where you got them
C．when will you get them
D．how will you get them