15. Sometimes a written message succeeds ( ) an oral one fails; at other times, talking to the recipient will produce results that the printed word can't match.

25. It is ( ) to keep a note of these important data, so we won't lose them.

24. The discovery of the New World is a ( ) in the world history.

23. This drink is very tasty, and it is nutritious as well, as it is ( ) with vitamin C.

22. Your earnings will be in ( ) to the amount of work you do.

21. nn hurried back, having a guilty ( ) at leaving her daughter at home alone.

20.Firms that use computers have found that the number of staff ( ) is needed for quality control can be substantially reduced.

19."If you frequently forget where you parked your car, there is an app that (could) be what you're looking for." The underlined word expresses ( ).

18."It (is taking) forever to upload an album." The underlined part expresses ( ).

17.One can never be happy if one is always envious ( ) others.

16.My mother (would have been) in Beijing by now if she had not missed the train. The underlined part in the sentence expresses a(n) ( ).