Scientists are convinced ______ the positive effect of laughter ______ physical and mental health.
– How did you know each other? – Well, 2 years ago when I went on ______ trip to Yangshuo, we took ______ shelter from rain in the same cafe.
—Whom would you rather have ____ with you, Mary or Jane? —___.
Allen had to call a taxi because the box was ____ to carry all the way home.
—Do you know the most ancient city in China—Xi’an well? —No,this is the first time I ________ here.
Our teacher told us that there ______ no end to learning.