—Tony, you must have noticed the student who broke the window. —I’m sorry. I _______ attentively.
---Jack failed the driving test again. ---The question is_____ we can help him avoid making the same mistake.
The world is full of wonders, _____ we open our eyes to see them.A. if only B. as if C even if D. only if
It was not until midnight ______ they reached the camp site.
The first decade of the 21st century ______ breathtaking, non-stop development in China.
______is expected, according to the online survey, is that house prices will not go up any more.