--- I am sorry to have much of your spare time. --- That’s OK, and I am glad to help you.
This is the mountain ______ the top is always covered with snow.
The boy ______ composition won the first prize is the youngest in the group.
This is the very room ______ I slept in that evening.
We talked about the things and persons ______ we remembered at school.
John said he’d been working in the office for an hour, ______ was true.