Mr．Smith is always on time for everything．How ____ it be that he was late for the important meeting?
A． should B． can C． may D． must
---Your grandfather still seems very energetic, although he is already in his seventies now.
---Yes, he _______in the army for three years when he was young.
A． would serve B． served
C． had served D． has served
Many plants could move northward and toward the Pacific coast _______rising temperatures and changes in rainfall.
A． for fear of B． in defense of
C． by means of D． in reaction to
Once a schedule is made, by strictly _______ it, you can avoid putting off till tomorrow what should be done.
A． arranging B． measuring
C． observing D． presenting
---Mr．Black, I just can’t get my car started．I think there’s something wrong with the engine.
---Oh, let me see．Ah, that is not _______ it is．Actually, your car has used up all the petrol.
A． where B． when C． what D． how
I was once ashamed to admit my weakness, but now I have no such feeling and I _____myself much discomfort.
A． bring B． save
C． offer D． promise
