The rescuing soldiers in the helicopters ________ to land on that earthquakestricken area, but failed again and again.[ ]

I would like to have your opinion about my essay.—Hmm, you need make _____ changes to it, because there are some text construction errors.

Hurry up, _____ we’ll miss the opening ceremony of the sports meet.[ ]

Was it in 2002 __________ he was still atmiddle school __________ the boy became expert at computer

.—why, Jack, you look so tired! —Well, I _____the house and I must finish the work tomorrow