Below the topsoil of the earth is the subsoil, _____ layer that contains stones mixed with a small amount of _____ organic matter.
--- What are you going to do tomorrow ? ----How about going to buy Michael Jackson CDs? ----- ______________
The old man would appreciate _____ if you could do him that favour.
It is reported that this kind of vegetables _ a lot of vitamins C. A. contains B. includes C. holds D. keeps
______ time went by , Herbert could finish all the maths exercises in class.
Lots of the scientists in our country are working hard to ____the planet Mars .