These weapons add a new（）to modern warfare.

单项选择题Every teacher ought to（）kids to think about current issues.

A.incorporate
B.reinforce
C.challenge
D.transform

单项选择题The sale usually takes place outside the house, with the audience（）on benches, chairs or boxes.

A.seated
B.seating
C.having seated
D.having been seated

单项选择题Beijing has reiterated that（）will China use nuclear weapons first.

A.under no circumstances
B.under any circumstances
C.under every circumstances
D.under all circumstances

单项选择题Everything（）if Albert hadn’t called the fire brigade.

A.had been destroyed
B.was destroyed
C.would be destroyed
D.would have been destroyed

单项选择题I don't mind（）the decision as long as it is not too late.

A.you to delay making
B.your delaying making
C.your delaying to make
D.you delay to make