【单选题】
I was caught up ___________ conversation with a friend when someone knocked at the door.
【单选题】
She _____ useful knowledge of the English by careful study.
【单选题】
Problems can ______ when people have no knowledge of law.
【单选题】
Many people dream ___________ living on an island in the South Sea.
【单选题】
The class has a/an ____ of 27 students.
【单选题】
Be it ever so humble, there is no place like___________ .
【单选题】
Theres something ___________ going on.
【单选题】
The work will be finished ___________ , but I dont know when.
【单选题】
Brass is similar ______ gold ______ color.
【单选题】
______ hearing the news, all of them jumped with joy.