Scientific surveys conducted during the climbs ______that Mount Huandoy in Peru______ 6395 meters high

respect others ______ their economicbackground, you should be able to make lots of friends

Bad luck! I lost my wallet again!—________．You’re always too careless with it.

You can see the stars on a clear night, but in the daytime they are ____ .

Let’s volunteer to help homeless people. —_________