As autumn announces its coming, the trees _____ turn yellow, which means winter will draw near too.
| A．freely | B．actually |
| C．gradually | D．frequently |
The _______, I think, he drew from his simple experiment is not scientific.
| A．charge | B．conclusion | C．promise | D．relation |
Alice received an invitation from her boss, ________ came as a surprise.
| A．it | B．that | C．which | D．he |
Most people find it hard to ________Beijing Opera to foreigners because of cultural differences.
| A．get across | B．get over | C．come across | D．come over |
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 |
It is still under discussion _________ the old bus station should be replaced with a modern hotel or not.
| A．whether | B．when | C．which | D．where |