Some more answer suggestions from JJW –
please note:
1. I have indicated the sentence numbers by [size=150]α, β, γ, κτλ
Lesson 24. / Paragraph 237.
a. b.
g. xwri/on (i0sxuro\n) e1sxen* u9pe\r thn\ kw/mhn.
d.
ei)=xen
if imperfect is needed instead of aorist
Lesson 25. / Paragraph 247.
a. b. g.d.
e. h9 diw~ruc makra/ e0sti kai\ stenh/, ge/fura d’e1pestin.
Lesson 26. / Paragraph 257.
a.
b. th=j ma/xhj e0pau/santo nukto/j.
g.
d. oi9 toco/tai o1rniqaj kai\ o1nouj a0gri/ouj e0to/ceusan** e0n tw~| pedi/w|.
e. kateko/ph to\ stra/teuma u9po\ tou/twn tw~n barba/rwn.
e0pau/onto
e0to/ceuon
if imperfect is needed instead of aorist
Lesson 27. / Paragraph 266.
a.
b. e9ko/ntej e0poreu/onto pa/ntej oi9 stratiw~tai .
g.
d.
e. pa~n to\ stra/teuma e0poreu/eto dia\ tou~ pedi/ou parasa/ggaj pe/nte kai\ ei1kosin.
e0poreu/qh
if aorist is needed
Lesson 28. / Paragraph 277.
a.
b.
g. oi( de\ stratiw~tai e0bo/wn toi~j fu/laci pau/esqai.
d. (o9 a1nqrwpoj) ou[toj e0rwta|~ ei0 to\ stra/teuma tima~te.
e.
*qauma/zete
I would prefer
Lesson 29. / Paragraph 284.
a.
b.
g.
d.
e.
Thanks very much for the amendments 
I’ll make the changes in my posting.
I often find it difficult to know, in these short sentence exercises, whether to use the imperfect or the aorist - a longer passage would give the flavour of the writer’s intent - i.e. duration of past action versus its more rapid completion.
And there’s no easy way with this font to insert ( )'s to enclose alternatives.
Cheers 
[quote author=Koala link=board=2;threadid=293;start=0#1953 date=1059117380]
And there’s no easy way with this font to insert ( )'s to enclose alternatives.
[/quote]
Maybe – --, so [size=150]ἐτόξευσαν ‐‐ ἐτόξευον ‐‐