ii. Combine these sentences, using WHICH, WHERE, WHEN :
1. Ha Noi is the place. I'd like to come to Ha Noi.
2. Summer is the time. The weather is very hot then.
3. The bed was comfortable. I slept in it last night.
4. I never forget the park. We met each other for the first time at this park.
5. I do not know the reason. She left school for it.
6. We have not decided the day. I'll go to London on that day.