Then
P : it struck me
Q : of course
R : suitable it was
S : how eminently

The Proper sequence should be:

I read an advertisement that said
P : posh, air-conditioned
Q : gentleman of taste
R : are available for
S : fully furnished rooms

The Proper sequence should be:

Since the beginning of history
P : have managed to catch
Q : the Eskimos and Red Indians
R : by a very difficult method
S : a few specimens of this aquatic animal

The Proper sequence should be:

If you need help
P : promptly and politely
Q : ask for attendants
R : to help our customers
S : who have instructions

The Proper sequence should be:

It is easier
P : to venture into space
Q : for men
R : beneath their feet
S : than to explore

The Proper sequence should be:

It was to be
P : before their school examination
Q : which was due to start
R : the last expedition
S : in a month's

The Proper sequence should be:

This time
P : exactly what he had been told
Q : the young man did
R : beyond his dreams
S : and the plan succeeded

The Proper sequence should be:

In the darkness
P : the long, narrow beard
Q : was clearly visible with
R : the tall stooping figure of the doctor
S : and the aquiline nose

The Proper sequence should be: