The chairman thought _________ necessary to invite Professor Smith to speak at the meeting.
.Not until the third day after the terrible earthquake ______ a phone call from his mother.
.Since you are here, you ____ as well stay here for long.
---Why was our foreign teacher unhappy yesterday? ---News about the tsunami striking her country ______ an attack of homesickness.
---As we all know, reading gives our minds only materials of knowledge. ---Yes. It’s thinking that makes _____ we read ours.
---Where is my reference book? It was here a moment ago. ---Someone ______ it by mistake.