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

Anyone who applies for the position must meet the requirement ______ he or she should have a good command of English.

I have no doubt in my mind______ they will be glad to see me.

Nobody knew that the reason______ he was often blamed. Perhaps that was______ he made the same mistakes told several times.

There are many kinds of birds in Australia,and over 140 species of snakes,many of              ____are extremely dangerous.