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
Mr．Smith had to go to work by bus this morning as his car ______．
A． would repair B． was repairing
C． had been repaired D． was being repaired
Food and fruit are forbidden in the library, ______ you are allowed to have drinks and sweets with you．
A． and B． but C． so D． or
Being ______ highly skilled reader is ______ key to becoming successful in the Information Age．
A． a; 不填 B． 不填; a
C． the; a D． a; the
