_____ you always question everything I say? — Sorry if I make you unhappy, but it’s my habit to question before I believe. [ ]

I think at the beginning of each book a__________ introduction to it is necessary.

Li Ming enjoys _____ English every morning. He is good____English.

She showed the visitors around the museum, the construction________had taken more than three years.

Jim sits behind me, so I sit ________________ him.