• If he wants it, we'll buy it.
• If it doesn't work, we'll take it back.
• They won't go on holiday this year if their friends come to see them.
• You will be tired tomorrow if you don't go to bed early.
• Will the boys wear their new T-shirts tomorrow if it is sunny?
• The cake will burn if he doesn't turn off the oven.
• We won't go to the beach tomorrow if it rains.
• Will you walk to school if the bus doesn't come soon?

1. don't stop

2. taught

3. is studying

4. will do

5. has been/ was

6. do you do

7. didn't know

8. will not able to

1. don't stop

2. taught

3. is studying

4. will do

5. has been/ was

6. do you do

7. didn't know

8. will not able to

If he (want) wants it, we'll buy it.

1. If it (not/ work) doesn't work, we'll take it back.
2. They (not/go) won't go on holiday this year, if their friends come to see them.
3. You will be tired tomorrow if you (not/ go) don't go to bed early.
4. The boys (wear) will wear their new T-shirts tomorrow if it is sunny?
5. The cake (burn) will burn if he doesn't turn off the oven.
6. We won't go to the beach tomorrow if it (rain) rains.
7. Will you walk to school if the bus (not/ come) doesn't come soon?

Đối với phần trắc nghiệm, dưới đây là câu trả lời:

1. If we don't stop cutting down so many trees, we'll endanger our oxygen supply.
2. Last year Mr. Johnson taught us Robotics.
3. My sister is really busy - she is studying for the exam.
4. In the future, robots will do things that people can't do or don't want to do.
5. Mark has been to Sa Pa twice. The first time was more than ten years ago.
6. How often do you do household chores? - Every day.
7. Twenty years ago, most people around the world didn't know what the Internet was.
8. If we dump all sorts of chemicals into rivers, we won't be able to swim in them in the future.