—Why didn't you give a hand to the boy?—I __________ but he __________ to his feet before I tried to.
I ___ I could fly to the moon by spaceship one day.
I don't know when he ___. But when he ___ back, I’ll let you know.
Mr. King, manager of a big department store, is about to pay a visit ___ Chian next month.
Could you ___the radio a little? It’s too noisy.
Once ___, it can never be forgotten.