The little boy was in danger. The doctors and nurses are doing him.
| A．what they can do help | B．everything they can help |
| C．what they can to help | D．all what to help |
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 |