______ it have been the failure to pick up directions from the ground control that caused the air crash?
The suggestion we should have a discussion on this problem is not the one ________he made.
My suggestion is that Tom ______ there on time.
--- Why didn’t you tell me the news of the meeting? --- I knew nothing about it, or I _______ you.
Don’t forget _______ all the lights when you leave the classroom.
This book is very interesting, and it is worth ________ again.A to read B.reads C.read D.reading