1. It's important to keep the environment clean.

2. the time machine will be showed to the public when they finished .

3.  he was delighted that he received his aunt's letter.

4., people recycled old car tires to make shoes and sandals.

5. i'm very sad not be accepted in that group.

1. It's very important to keep the environment clean.

2. The time machine will be shown to the public when they are finished.

3. He was delighted that his aunt sent him a letter.

4. People recycle old car tires to make shoes and sandals.

5. I'm very sad not to be accepted in that group.

1. Minh has collected stamps since he was a child.