A.perform B.profit C.drift D.competently E.in practice
F.register G.evidence H.alert I.transparent J.in advance
11.The profit we gained while working in this field were not only financial but also intellectual.
12.Most students register over 90% in the exam; few,in fact,scored below 80%.
13.The little girl watched the balloons as they drift up into the sky.
14.In theory,this sounds like a good idea; however,I doubt that it will work in practice.
15.I think Tom played the role very competently.
16.We should make our reservations as far in advance as possible to get the flight we want.
17.He drew out a transparent plastic bag and held it up to the light to show me the golden fishes inside.
18.The police have had to drop charge against him because they couldn’t find any evidence.
19.A good hunting dog is alert to every sound and movement in the field.
20.Some athletes take drugs to improve their performance.
Please note:N0.20 The correct word is " performance" (a noun)