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 |
I would appreciate ______, to be frank, if the goods could be delivered as soon as possible.
| A．you | B．this | C．it | D．myself |
He ________ to Shanghai, for I saw him a moment ago.
| A．must have gone | B．can’t have gone |
| C．mustn’t have gone | D．can’t have been |
This reading passage ____ two letters ___an agony aunt of a teenage magazine.
| A．is made of; writing to |
| B．is made up of; written to |
| C．is consisted of; written to |
| D．consists of; writing to |
The manufacturers disclaim all ______ for damage caused by misuse .
| A．determination | B．attitude |
| C．responsibility | D．quantity |
-------What do you suppose made him so unhappy?
------- ________ his wallet.
| A．Losing | B．Lost | C．lose | D．To lose |