China's reform and opening has been going on for ________ is like about 30 years now and it's really quite remarkable.
This is the bag ________ my mother bought yesterday.
He made another wonderful discovery, _____ of great importance to science.
Luckily, we'd brought a mad map without _______ we would have lost our way.
The boss ______ department Ms.King worked in ten years ago looked down upon women.
He bought a book that could glee him much knowledge and ______ could help him to kill the time.