Along with the letter was his promise _______ he would visit me this coming Christmas.

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

There is a new problem involved in the popularity of private cars _______ road conditions need _______. 

My parents used ________they had to get a new car for my brother.

—Is that the small town you often refer to? —Right, just the one ________ you know I used to work for years.