You can find whatever you need at the shopping centre, __________ is always busy at the weekend.
_______ many times, he still couldn't understand.
Many things _______ impossible in the past are very common today.
The students in the university are all taking courses _______ a degree.
. _______ different kinds of pianos, the workers farther improved their quality.
A person _______ a foreign language must be able to use the foreign language _______ all about his own.