．Life is too short to waste and too ________ to give up.
A．expensive B．fragile
C．precious D．ordinary
The law required that everyone ________ his car checked at least once a year.
A．has B．have C．had D．will have
．Our teacher is very busy.He is ________ in working out a teaching plan.
A．involve B．involving
C．involved D．to involve
Beijing Man used fire for cooking food and also for light, warmth and ________
wild beasts.
A．protected from B．protection from
C．protecting from D．to protect from
The doctor strongly recommended that he ________ a holiday.
A．would take B．took
C．had taken D．take
Mr.Smith, there's a man at the front door who says he has news for you ________
vital importance.
A．of B．with C．in D．from
