23.（单选题）I’d like to talk about how to expand the export business of the company.

29.（单选题）Many fashions are _________ on the website.

28.（单选题）Nowadays, Internet _________ is a rapidly developing industry in China.

27.（单选题）It ______ true that sport is about competing, not winning.

26.（单选题）This river is badly ______ by life wastes.

25.（单选题）Some______ baby food is contaminated, thus harmful to health.

24.（单选题）It______ to my pleasure to see you here today.

23.（单选题）Computers have greatly increased ______ in business offices.

22.（单选题）You ______ to be here an hour ago!

21.（单选题）Too rich a ______ is not good for all of us.

20.（单选题）We encourage ______ to complain about faulty foods.