On seeing the movie star appeared on the stage, the audience ________ cheering.

It is bad manners to ________an invitation without areason.

drinking used to be acceptable, butas drunken driving has caused so many tragedies public opinion is nolonger________

22.______ in natural gas and oil, so thisarea is worth developing.

Do you often _____ information for your lesson on the Internet -Yes, I do.