Chọn giới từ (for/since/ago) cho phù hợp với từng câu.
Choose the correct word to complete the sentences
1. He has just got a new job, and he's going to work in China-.(for/since/ago) six years.
2. It's ten year--..(for/since/ago) we last met.
3. --...(for/since/ago) 2000, the team has lost many times.
4. I haven't had a look at it-(for/since/ago) yesterday.
5. It's ages-..(for/since/ago) we said goodbye.
6. They sold the palace twenty year--.(for/since/ago).