Gun control is a subject _________ Americans have argued for a long time..
| A．of which | B．with which | C．about which | D．into which |
Sometimes, the entrance tickets are _____ free of charge from the university．
| A．available | B．valuable | C．imaginable | D．accessible |
People are advised to be _____ towards the health concerns of their dear ones while burning firecrackers to celebrate the festival, for they contain harmful chemicals．
| A．accessible | B．aware | C．cautious | D．sensitive |
We had planned to finish the work before dark, but the heavy rain _____ us _____．
| A．build, up | B．put, up | C．bake, up | D．hold, up |
He always dreams of ______ a chance for him to go abroad for further study．
| A．there being | B．there to be | C．there is | D．being |
To keep healthy, most retired old people _____ jogging as a regular form of exercise．
| A．take up | B．make up | C．carry out | D．hold out |