At the age of fifteen she gave up taking piano lessons to _____ her school work.
| A．hold on | B．call on | C．put on | D．concentrate on |
For breakfast he only drinks juice from fresh fruiton his own farm.
| A． | grown |
| B． | being grown |
| C． | to be grown |
| D． | to grow |
Scientists have many theories about how the universeinto being.
| A． | came | B． | was coming |
| C． | had come | D． | would come |
We tried to find a table for seven，hut they were all．
| A．given away | B．kept away | C．taken up | D．used up |
a certain doubt among the people as to the practical value of the project．(D)
A．It hasB．They haveC．It remainsD．There remains
China has got a good for fighting against the flu with its careful and smooth organization．
| A．reputation | B．influence | C．impression | D．knowledge |