The Diaoyu Islands have been part of China’s territory since ancient times, __________ as important fishing grounds of Taiwan.
No one can be sure _______ in a million years.
________ the decision must be made immediately requires questioning.
_______caused the accident is still a complete mystery.
________ we can’t get seems better than _______ we have.
His writing is so confusing that it’s difficult to make out ________ it is he is trying to express.