—What are you busy with?

—The conference______in our city next week, as you know.

A. held　　 B. will be held　　　　 C. be holding　　　　 D. to be held

I lost my way in complete darkness and, ______ matters worse, it started to rain.

　　 A. made　　　　　　 B. having made　　　 C. making　　　　　 D. to make

Mike has an active mind;he can retell a story____anybody else in the classroom.

　 A.more vividly than　　 B.much vivid than　　　 C.as vivid as　　 D.so vivid as

—Why are your hands so dirty?

　 —I　　　　 in the garden．

　 A．was working B．have workedC．workedD．have been working