Complete the sentences

India, China, Japan, and Russia all ______ (have) plans in place.

If they ______ (go), they ______ (learn) more about the moon than ever before.

Those astronauts _______ (go) there between 1969 and 1972.

Other countries ______ (make) preparations to go to the moon, too.

This was during a period of time when scientists _______ (study) the moon very closely.

Some private companies ______ (hope) to make a profit from moon tourism.

They ______ (want) to go before 2020.

Today, NASA astronauts ______ (plan) another trip to the moon.

Only 12 people _______ (be ever) on the moon.

Since then, scientists ______ (learn) many thing about our closest neighbor.

In 1969, the spacecraft Apollo 11 _______ (land) on the moon for the first time.

They ______ (begin) to take reservations for future flights.