My good friend’s name is Jim Green. Green is his ___________.

I like your new leather boots! —Thanks．I had to try on almost a dozen pairs ______ I decided to get them

There are many beautiful hats here. I really don’t know_______.

He started to work dilligently _____ he came up with the idea of hybrid rice for the first time in the 1960’s

Nancy enjoyed herself so much ___ she visited her friends in Sydney last year