We must know what we should do and what we should avoid _______ a good impression on others in public places.
| A．to leave | B．leaving | C．to have left | D．leave |
相关试题
One of the first things Joan did ____ getting home was to water her flowers．
| A．by | B．on | C．at | D．for |
Kids should be encouraged to get involved in activities ___ they meet other kids．
| A．that | B．what | C．which | D．where． |
After working abroad for several years．Gill wants to settle down to a ____job in Britain．
| A．normal | B．constant | C．permanent | D．primary |
In 1519 ____ traveler who went to American from Europe discovered ____tomato．
| A．the; the | B．the ; a | C．a:．a | D．a; the |
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