104.（单选题）The reason he quit the job is ______ he hadn’t got promoted for 5 years.

24.（填空题）Vocational education aims at _____ （build）up students’ practical skills.

23.（填空题）The girls ______ （dress）up as movie characters in this exciting festival.

22.（填空题）Keep your sales receipt and the original ______（package）.

21.（填空题）Team members will be selected according to a number of strict ______ （criterion）.

20.（填空题）The firm is in a ______ （potential）dangeroussituation.

19.（填空题）The new technique will ______ （able）them to doubletheir production.

18.（填空题）Remember that smoking is ______ （harm）to you.

17.（填空题）A ______ （chemistry）element of water is oxygen.

16.（填空题）It is a seriously ______ （contamination）river.

15.（填空题）They sell this shirt in _____ （variety）colors and sizes.