1. The house has been built since last year but it hasn't finished yet. 

2.Hoa just rode from country to the city so she didn't use to ride a bike in the street. 

3. Printer doesn't work because the plug become socket.

4. Ba has studied English for 4 years but she doesn't know how to write letter in English. 

5. We have 2 weeks seaside recently.

II.

1. Have you ever been a part of rice festival ? No, this is my first time. 

2. Do you Nam's penpal 2 years ago ? We began friends when we were in grade 6. 

3. How often does the film show on TV? Twice. 

4. When have you been to Hanoi ?  We have been there since I was born. 

5. What has my mother just taked you ? She said " Park".

III.

1. Safety | unsafe 

2. pronounce | pronounciation 

3. behaver | behaves 

4. satisfying | satisfied 

5. sociable | society

IV.

1. My father's smoking has stopped for 2 months. 

2. This is the first time I saw this film.

3. I didn't see him 3 days ago. 

4. My hair had just been cut. 

5. Since Mrs. Lan has taught at the age of 22.

V.

1. noisily 

2. recently 

3. smile

4. knowledge 

5. Bite.