Birds' singing is sometimes a warning to other birds __________ away.
| A．to stay | B．staying |
| C．stayed | D．stay |
（届安徽省桐城市第十中学高三上学期第三次月考英语试卷）
_______ she was invited to the ball made her very happy.
| A．Whether | B．That | C．Because | D．What |
（2014届浙江省建人高复高三上学期第五次月考英语试卷）
It never occurred to me _____ you could succeed in persuading him to change his mind.
| A．which | B．what | C．that | D．if |
（届湖南省十三校高三3月第一次联考英语试卷）
_____ is well known to the world is that China has very top technology in space industry．
| A．It | B．As | C．What | D．Which |
（届福建省莆田市高三3月质量检测英语试卷）
It is not immediately clear __________ the housing price will go down.
| A．how | B．what | C．that | D．whether |
（届河南省偃师高级中学高三下学期第一次月考英语试卷）
_____________ made Jim most excited was, I think, ____________ he had passed all the exams.
| A．That, what | B．What, which | C．That, which | D．What, that |