Wind power is an ancient source of energy ____we may return in the near future.
A．on which B．by which
C．to which D．from which
Without the ____ of my friends, how could my company have lived through the hard times.
A．admiration B．assistance
C．admission D．achievement
___ with various research projects, that scientist can’t even find time to visit his parents.
A．Occupying B．Occupied
C．To be occupied D．To occupy
— Thank God you’re safe!
— I stepped back, just ____ to avoid the racing car.
A．in time B．in case C．in need D．in vain
— Don’t worry, Mum. The doctor said it was only the flu.
—____! I’ll tell Dad there’s nothing serious.
A．What a relief B．Congratulations
C．How surprising D．I’m so sorry
All flights ____ because of the snowstorm, many passengers could do nothing but take the train.
A．had been canceled B．have been canceled
C．having been canceled D．being canceled
