万一明天下雨的话, 我们将不得不推迟参观颐和园。
Happy birthday,Mary!So you have___twenty-one already!
____,the student insists that he be separated from his desk-mate,who is naughty.
We had wanted to finish our task by noon,but it didn’t quite _____ as planned.
It isn’t clear_____ is to blame.We need to find a solution to the problem first.
I saw a woman running toward me in the dark.Before I could recognize who she was,she had run back in the direction____she had come.