1．The study suggests that ．secondhand smoke may be terrible and under-recognized cause of heart attack deaths
A．a：a B．the；a C．／；a D．／；the
2．…Please tell Tom that he has won the first prize in the maths contest．
… ．!He never did so well before
A．Congratulations B．Of course I will
C．What a good surprise D．That’s right
3．The only problem was 。we kept getting lost! But people in Tianjin are very friendly and helpful
A．why B．whether C．that D．how
