The policy of the mainland is very clear and straightforward，and the key problem is ______ the leaders of Taiwan will accept it.

The village I grew up _________ was destroyed by the earthquake last year and is under construction now.

He was caught in the heavy rain.That’s ___ he was ill.

. It was the fact _______his father was ill in hospital_________ worried him and kept him awake for a whole night .

Do you have any idea of the reason _____ he referred to？