I didn't forget your birthday 

where she was going then

I knew her address, I could write to her

I arrived in Hanoi and stayed with him last week
I was worried that you wouldn't come back
entertainment
wonderful
celebration

B - C - A - B - B - B - A - A - B - A 
15, A -> DIDN'T GO

Environmentalists

installed

joyful

Luckily

pollution

solar

considered
environmentally 
occurrence 
destructive
providing
priority
Ninety percent of earthquakes occur around the Pacific Rim, which is known as the "Ring of fire"

He is a considerate and generous man who is loved not only by his family but also by all his friends

take showers, we will reduce the amount of water our family uses
dog was run over was terribly upset 
hands should be washed regularly
speaks English excellently

non-existent

1. I think we shouldn't use electricity ti catch fish 

→ I suggested not ...using electricity ti catch fish ...

2. Eat less meat or you will have high cholesterol in your blood

→ If you .eat less meat, you will not have high cholesterol in your blood..

3. Smoke filled the room when she wakes up

→ The rooms ..were filled with smoke when she wakes up.. 

4. I met a generous man on my way home yesterday

→ The man whom I met on my way home yesterday is generous 

1. He has never been late for work.

- Never……………………has he been late for work………………………………………………………………

2. The man is my new boss. He is talking to the lady over there.

- The man ……………………who is talking to the lady over there is my new boss……………………………………………………………

3. “Does Mr. Pike live here?” the postman asked the boy.

- The postman asked the boy …………………………… if Mr Pike lived

4. They will build a new school next month.

- A new school…………………will be built next month…………………………………..……………………..

5. Finding an apartment in a big city is not easy.

- It is …...............................not easy to find an apartment in a big city........................................................................

1. Yes, they are.

2. We will use up all the fossil fuels in the 21st century. 

1. "Why don't we take a trip to the countryside?" He said.

-->He suggested________taking a trip to_______ the countryside.

2. John has received a scholarship. John's grades are the highest in the school.

-->John________, whose grades are the_______ highest in the school, has received a scholarship.