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

Have you heard of Earth Day—Yes. The first Earth Day ____ in 1970 to educate us to protect our planet.

Chemistry seems to be _____ for me of all thesubjects.

They discussed ________ they could settle the problem without others’ help.

I’ve got one more page to write; ________I’ve finished.[ ]