Fill the blanks with the correct forms of the words in brackets.

Air

is a big problem in many cities in the world. (pollute)

Choose the best answer to complete the sentences below.

It’s so _____________ to send a letter from my village. The nearest post office is miles away.

Choose the best answer to complete the sentences below.

My 6-year old brother really enjoys ___________ in the rain, which is sometimes dangerous.

Choose the best answer to complete the sentences below.

I know she has worked  much_____________ this semester than she did last semester.

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She prefers _______ with real people to _______ someone virtual on the Internet.

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Not many people can explain the ______________ of the customs and traditions at Tet.

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In my family, children __________ permission before leaving the dining table.

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He is very studious. He always________ late at night.