The boy student is poor in health now; his parents wish that his health _____when he grows up

____you had worked hard, you would have easily passed the final test.

– Is John coming by train?– He should, but he _______ not. He likes driving his car.

—What happened to the young trees we planted?—The trees       well, but I didn't water them.

---Someone’s been here. Who ___ it be? It looks like Helen.---It ___ be Helen.She is ill in hospital.