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

C. Made

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

While mother________ dinner, the phone rang.

Alan took a photograph of Sandra while she________

D. Hadn’t looked

Fish________ on earth for ages.

The earth________ on the sun for its heat and light.

They ________ this course by next June.

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

I don’t feel good. I ________ home tomorrow.

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

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

In one year’s time, I________ in this school for 15 years.

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

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

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

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