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.

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

The earth________ on the sun for its heat and light.

We________ a part next week. Would you like to come?

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

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

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

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

They ________ this course by next June.

Alan took a photograph of Sandra while she________

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

Last night Tine________ in bed when suddenly she heard a scream.

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

While mother________ dinner the phone rang.