Improve the highlighted part of the sentence given below.
We were $not$ the wiser for all this effort to explain the case to us.

Improve the highlighted part of the sentence given below.
This telephone number $is\, not\, existing.$

Improve the highlighted part of the sentence given below.
Most donors would seriously $protest$ any effort to extrapolate from such limited data.

Improve the highlighted part of the sentence given below.
We $had\, nothing$ to eat since $8$ o'clock this morning.

Improve the highlighted part of the sentence given below.
In fact,if it hadn't been for his $invaluable\, advice$ on so many occasions $I$ wouldn't have achieved anything in life.

Improve the highlighted part of the sentence given below:
"$There\, is\, no\, more\, room$ for you in this compartment."