--Did you have a good vacation?-- . I enjoyed myself with my family on the beach.
Last month I traveled across the Sahara Desert by ______ camel with some locals.What ________ amazing experience!
The light bulb ______ by Edison in the middle of the 1780s.
The old scientist has made a great contribution the moon.
—What is the table made _______?—Wood.
Many countries have a lot of rockets into space.