Simple actions like putting rubbish in the bin can help to …………. the environment.

• protect  

• protector 

• protection 

• protective

Answer explanation

To + V

Đuôi y, ic, ical, ful

• N

• Adj

• V

• Adv

Đuôi -IZE / -ISE

• V

• N

• Adv

• Adj

Đuôi -LY

• V

• Adv

• N

• Adj

Đuôi -MENT , -TION

• Adv

• V

• N

• Adj

______________, we didn't finish on time.

• fortunate

• unfortunate

• unfortunately

She _____________ opened the door to not make any noise.

• carefully

• care

• careless

• careful

____ gases from many factories destroy the ozone layer. (Poison)

His parents were ...........……that he failed the final examinations. (disappoint)

Air …………….……is one of the problems that people have deal to with. (pollute)