Câu hỏi:

Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions.

Don't forget to write to me soon, ____?

Mark the letter A, B, G, or D to indicate the correct answer to each of the following questions.

The waste ____ system here is also innovative. There are no rubbish trucks or waste bins in the street.

Mark the letter A, B, G, or D to indicate the correct answer to each of the following questions.

Local authorities should find ways to limit the use of private cars and encourage city ____ to use public transport.

Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions.

You are expected to fasten the seatbelt ____ you are driving.

Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions.

If you need help, ____ me!

Mark the letter A, B, G, or D to indicate the correct answer to each of the following questions.

Located about 60 km southwest of Seoul, this eco city has been planned around a central park and designed so that every resident can walk to work in the business ____.

Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions.

Let's go out tonight, ____?