A.
1. When you don't understand what a person intends to say, you should ask he or she directly
2. A lot of energy and resources can be saved by recycling
3.Life in Vietnam in year 2040 will be very different from what it is now
4. Trang and I saw a very interesting movie yesterday
B.
1. Scientists said that in 50 years time we might be living on the moon
2. The examiner asked if I was good at English and I could speak any other languages
3. Because of the sickness, Ba didn't go to school yesterday