An increasing number of aged motorists from driving for health problems.

d that you made a bicycle trip to the 2010World Expo of Shanghai alone.—No. Actually, my friend Bob ________ me.

(2013·咸阳二模)We should keep in mind that the earth is our only home and only by saving the environment________ourselves.

Ithinkmaths____veryinteresting.

_______, you will get used to the life here and have your understanding of life.