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The water _______ in nature ensures a continuous supply of nutrients to aquatic ecosystems.

A. challenge

B. hardship

C. despite

D. cycle

He had asked the permission of his boss.

A. Past perfect

B. Present perfect

C. Past simple

This lesson is ______________ yesterday’s lesson. (boring)

A. most boring than

B. more boring as

C. boringer than

D. more boring than

At Tet, people usually light fireworks which can scare _______________ bad luck

A. away

B. for

C. about

D. on

E. of