Up to Tuesday's attack, the worst school shooting in the U. S. was in March 1998 in Jonesboro,________ two boys, aged 11 and 13, shot and killed a teacher and four girls.
The surface of the table ______ smooth enough.
一Why didn’t you try your best to get on the bus? 一I tried to,but ______ I could,it started moving.
You seem to have a ready—made answer _______ I ask you a question.
一You have made great progress in your studies of English,haven’t you? 一Yes,but much _______ .‘
________ to overcome the difficulty,he works day and night.