Researches are convinced ______ the positive effect of laughter ______ physical and mental health

Did you enjoy the book? — Yes, it was so interesting that I could hardly ____it.

I had to call a taxi because the box was ______ than I’d expected.

Cai Qin has given concerts all over China and the tickets have always_______.

Susan is _____ to come and see me this Sunday evening.[ ]