Help:
Task V. Choose the right relative pronoun : (A) who or (B) which!
1. The man … lives next door ….. never says a word.
2. I like living near London, … is the most exciting city in the world.
3. The train to London , … leaves every hour, is a fast train.
4. We love our teacher … is very kind.
2. Which
3. Which
4. Who
Who испольуется для одушевленных предметов, Which используется для неодушевлённых.