Part 5:
1. It’s 3 years since I last saw Nam.
⇒ I haven't seen Nam for 3 years
2.They’ve just visited the factory. The factory produces agricultural products.
⇒ The factory they have just visited produces agricultural products
3. They are going to build a new school in my village .
⇒ A new school is going to be built in my village
4.There will be a shortage of water unless it rains.
⇒ If it doesn't rain, there will be a shortage of water
Part 6:
1. discovery
2. move
3. In
4. easily