______ the price of gas is starting to come down, many people are choosing to take the bus or the train instead．
A． Even though B． Now that
C． In case D． As though
______ Tina cares about most is whether the company provides opportunities for further education．
A． Which B． What
C． That D． Why
______ the sight was impressive on the top of the mountain, I made an effort to climb onto it．
A． To know B． Know
C． Known D． Knowing
We still have some other ways to solve the problem．You ______ be worried．
A． mustn’t B． can’t
C． don’t have to D． may not
Harry Potter has made reading popular again, ______ is why parents and teachers like the book, too．
A． that B． who
C． which D． what
Some countries have banned smoking in public places ______ public health．
A． improve B． to improve
C． improving D． improved
