They own two cars, not to _____ a motorbike.
.China is one of the largest countries in the world, _______ 9.6 million square (平方) kilometers.
The old sick lady entered the hospital, ______ her two sons.
_______ 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.