按照要求完成下列句子,每空一词。

小题1:My family name is Clark. (对画线部分提问)

______ ______ family name?

小题2:Tina likes pears. (改为一般疑问句)

______ Tina ______ pears?

小题3:Bill has an English dictionary. (改为否定句)

Bill ______ ______ an English dictionary.

小题4:Those are oranges. (改为单数句)

______ ______ ______ orange.

小题5:Tom has many balls. (改为同义句)

Tom has ______ ______ ______.

在混凝土基础达到设计强度的( )%以上时，才允许将设备就位安装。

A．40

B．50

C．60

D．70