II、单项填空(共20分)21. In the center of the room stood a table with a _____ lamp on it, so it is very bright in the room.
It has not been decided ____ they will leave.
The accident is reported to have occurred __________ the first Sunday in February.
The trouble is ____ we can not find such an expert.
People may have different opinion about Karen, but I admire her. ______, she is a great musician.
I am sure ____ you said is true.