单项选择题

Since Helen is angry, we had better（）

A．leave her alone
B．leaving her alone
C．left her alone
D．to leave her alone

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单项选择题

The air has leaked out of this football. Could you get it（）

A．blow
B．blowing
C．blown
D．to blow

单项选择题

（）that they may eventually reduce the amount of labor needed on construction sites.

A．So clever are the construction robots
B．So clever the construction robots are
C．Such construction robots are clever
D．Such clever construction robots are