19.（ ）

(单选题)Frank went back home, ______ to study much harder than befor (单选题)Unless ______ to speak, you should remain silent at the conf (单选题)It was in the cafe ______ she met John yesterday ______ she (单选题)The factory was built in a secret place, around ______ high (单选题)______ that she was going off to sleep, I asked if she’d lik (单选题)One of the important questions they had to consider was ____ (单选题)She is very important to us. We have been prepared to do ___ (单选题)She was a friendly teacher. She spoke to the students ______ (单选题)As a grassroots singer, she reads everything she can ______ (单选题)Everything ______ smoothly, more jobs created for people all