高一完形填空I got a lot of interesting experiences in a free schoo

高一完形填空
I got a lot of interesting experiences in a free school.At first I could not believe it.There were no___in rows or loud sounding bells,nor did anyone have to go to___.Although we lived "in",___made us go to bed at certain time;there was no "lights out".The good thing was that practically all the students went to class,and very few people stayed up late.Only the new people stayed up late or___class.The new ones always went wild___,but this never lasted long.Our teachers treated us like____;never did we have to play"stand up""sit down""speak out".I don't___one student who didn't try his best.
The subjects were the same as those in the___school,but what a difference is the approach!For example,in botany we had ___classes in the spring or fall,but instead we planted two gardens,a vegetable garden and a flower garden.Then in winter we each studied a few particular things about what we had grown.In maths the students built three different kinds of storerooms--small ones___,but usable.They did this instead of having lessons in the classroom.They really had a ___time,too,designing everything,drawing the blueprints,figuring out the angles and so on.I didn't take ___.But I could do the basic things with numbers.That's enough!On the whole I think I am a___person for having gone to the school.I can read and write as well as anyone else of my age,and I can think better.That's probably a really big___between the free school and regular school---the amount of ___
36.A.desks B.lights C.books D.windows
37.A.home B.bed C.class D.work
38.A.teachers B.parents C.nobody D.somebody
39.A.attended B.took C.missed D.studied
40.A.from then on B.at first C.once more D.just then
41.A.workers B.pupils C.gardeners D.grown-ups
42.A.hear from B.feel like C.think about D.know of
43.A.night B.regular C.small D.real
44.A.all B.short C.no D.indoor
45.A.as well B.after a while C.of course D.as a result
46.A.funny B.great C.convenient D.thoughtful
47.A.maths B.care C.botany D.notice
48.A.careful B.better C.busier D.lovely
49.A.problem B.chance C.difference D.change
50.A.reading B.gardening C
其中第40格为什么选just then ,from then on since then与之有什么区别吗?还有then 和next有什么区别
无须作答，回答最底下的问题即可

36 B.lights
37 B.bed
38.C.nobody
39.C.missed
40.D.just then
41.D.grown-ups
42.D.know of
43.B.regular
44.B.short
45.A.as well
46.D.thoughtful
47.A.maths
48.B.better
49.C.difference
50.A.reading B.gardening 我感觉还没有给出可选的正确答案
just then 仅仅那时候,from then on=since then从那以后
then可以做连词,next不可以 ,另外在词义上还是有一些区别的.then然后,next下一个,下一例