I have __ a raincoat _____ an umbrella.That’s why I have to wait until the rain stops.

To understand the grammar of the sentence, you must break it into parts

Now it’s been possible for us to be taken into “space”, ______ we can experience weightlessness for a short time[ ]

is known to all, hard work will_____ in time

The parents have devoted themselves to bringing up their children and now it is time for the children, ______, to show their devotion to their parents.