the exploration of the botanical world on a large scale.
| A．It was not until the eighteenth and nineteenth centuries that; had begun |
| B．It was not until the eighteenth and nineteenth centuries when; began |
| C．Not until the eighteenth and nineteenth centuries did; begin |
| D．Until the eighteenth and nineteenth centuries; began |
The manager spoke highly of such＿＿as loyalty，courage and truthfulness shown by his employees．
| A．virtues | B．features | C．properties | D．characteristics |
The medicine is on sale everywhere．You can get it at＿＿chemist's．
| A．each | B．some | C．certain | D．any |
If you＿＿the bottle and cigarettes，you'll be much healthier．
| A．take off | B．keep off | C．get off | D．set off |
When he realized the police had spotted him，the man＿＿the exit as quickly as possible．
| A．made off | B．made for | C．made out | D．made up |
Having decided to rent a flat，we＿＿contacting all the accommodation agencies in the city。
| A．set about | B．set down | C．set out | D．set up |