Sure! Here are the suggested answers for the fill-in-the-blank tasks:

1. Listen! My mother **(1)** sings a song.
2. Every night, We **(2)** go to bed at 10 p.m.
3. Giang **(3)** likes Music but I **(4)** like Math.
4. Now, they **(5)** stay in Hue.
5. My father **(6)** reads a newspaper in the morning.
6. Look! Ha **(7)** runs.
7. Trang usually **(8)** listens to the teacher in the class, but she **(9)** doesn't listen now.
8. Where **(10)** is your father?
9. He **(11)** is in the living room. He **(12)** is watching TV.
10. There **(13)** are many flowers in our garden.

For completing the sentences in the letter:

1. I **(1)** am writing this letter because it **(2)** seems to me that far too many changes **(3)** are taking place in my country these days, and as a result, we **(4)** are losing our identity. I **(5)** live in a small town but even this town **(6)** is changing before my eyes. For example, town authorities **(7)** are building a place where my favorite restaurant used to be. Our culture **(8)** belongs to everybody, and I **(9)** do not understand why our leaders **(10)** think to preserve it. They simply **(11)** do not care. In fact, I **(12)** think of starting an action group. I **(13)** appeared on a TV show this evening to make people aware of how important this issue is. It’s time for us to start doing before it **(14)** gets too late.

For the verbs in the correct form:

1. Lan (cannot have) **(1)** has many friends in her new school.
2. Hung (come) **(2)** is coming from Vinh but he (stay) **(3)** is staying with his...
3. Ho Chi Minh city at the moment.
4. You (not drive) **(4)** do not drive to work every day. We (go) **(5)** go by...
5. ...on the phone now, Minh?
6. ...your new friend (live) **(6)** lives on Hang Bai street.

Feel free to adjust any of these as needed!