There _______ a mother ,a father and three children in the family.
Driving in rush hour traffic ______ be very dangerous, so you _____ be too careless.
Jerry is always so busy that he can hardly _________ a few minutes to talk with his child.
---________ it is from our own planet Earth to Mars!--- Yes, it takes months to travel to Mars by spacecraft.
—Jim took ___ one-hour ride just now.What a short time he spent finishing such a long way!—He is ______ experienced rider.
The lady has devoted much of her time ________ South China tigers.A.to protectB.to protecting.C.Protected