______ the work is difficult, all the workers are keeping on working .
| A．But | B．Although | C．And | D．So |
—Why do you 
like Jack? —Because he ishonest boy.
A. a 
B. an C. the
Gina loves singers _______ write their own music.
A. which B. who C. has worked
Jim _________ in Zhuzhou 
since he finished his college.
A. works B. is working C. has worked
He knows _________ about computer than me.
A. much B. more C. most
Mary didn’t go to John’s birthday party because she ________.
A. wasn’t invited B. didn’t invite C. isn’t invited