【C18】A．beforeB．aboutC．afterD．at

【C9】A．againB．behindC．afterD．next

【C18】A．look overB．look intoC．look afterD．look out

【C5】A．untilB．onceC．afterD．since

【39】A．forB．inC．afterD．before

【C18】A．in the leastB．at leastC．not leastD．least of all

【C18】A．asB．uponC．ofD．at