On July 20, 1969, Neil Armstrong ________ down onto the moon, the first person ever set foot on another planet.

The Red River________ very fast today-much faster than yesterday.

In the last two decades, space exploration___great contributions to weather forecasting.

I________ "Chicken soup for the soul" but I haven’t finished it yet.

While mother________ dinner the phone rang.

She will go abroad as soon as she________ this English course.

If coastal erosion continues to take place at the present rate, in another fifty years this beach________ any more.

When boarding the plane, many passengers were annoyed because they ________ waiting in the airport for three ad a half hours.

I ________ my key. Can you help me look for it?

The earth________ on the sun for its heat and light.

I don't feel good. I ________ home from work tomorrow.

Their football team________ a championship until last season.

By the end of this year, Tom ________English for three years.

Alan took a photograph of Sandra while she________

The phone________ constantly since Jack won the first prize this morning.