A．wealthyB．preciousC．valuableD．priceless

B．cautious

C．collective

D．competitive

A．picking up

B．bringing up

C．putting up

D．pulling up

A．picking up

B．bringing up

C．putting up

D．pulling up

A．time spent on the way

B．changes in the route

C．kids' physical strength

D．safety of their children

A．does not consume fuel

B．aims to keep children fit

C．seldom causes traffic jams

D．is popular with school kids

A．take the shortest routes

B．shorten the school week

C．give drivers better training

D．use fuel-efficient buses

A．The great number of male smokers contributes to the age gap.

B．The growing number of smoking women will narrow the age gap.

C．Female workers are more likely to smoke than male workers.

D．Smoking does not seem to affect women's longevity.

A．margin

B．side

C．advantage

D．quality

B．cause

C．increase

D．avoid

B．the natural

C．wild

D．the wild