the whole process for the studies of cancer took more than a year, the technology is moving so fast that it will soon take just weeks.
Everyone likes to live in a house ______ windows face the south.
They talked about the persons and things ______ they remembered at school.
His English teacher is a young girl, ____ left college only last year.
This is the factory ______ I visited last week.
—Jack, could I use your laptop for a while? —___________. Go ahead, please.