26. So far， ___ winds and currents have kept the thick patch of oil southeast of the Atlantic coast.

A) governing B) blowing C) prevailing D) ruling

27. The author was required to submit an ________ of about 200 words together with his research paper.

A) edition B) editorial C) article D) abstract

28. As the old empires were broken up and new states were formed， new official tongues began to ________ at an increasing rate.

A) bring up B) build up C) spring up D) strike up

29. Many patients insist on having watches with them in hospital， ________ they have no schedules to keep.

A) even though B) for C) as if D) since

30. Some plants are very ________ to light; they prefer the shade.

A) sensible B) flexible C) objective D) sensitive

CDCAD