I direct drama at an international school in Bangladesh. My students speak excellent English as a second language, but their families have all levels of English ability. This is a Muslim country, so no sex, no alcohol, no divorce and no swearing. Not much guy/girl contact either. So I am looking for scripts with lots of physical humor (for those who do not have great English), clean, and not too much "Americana". They loved Charlie's Aunt but hated Cheaper by the Dozen.

We did "Stories of Scheherazade" from Pioneer last year, it was a smash hit. This year I wrote a play set in Bangladesh, but I can't do that every year. I am thinking about "Wizard of Oz" next year. But I want to hear any suggestions. Also, I have lots of kids come out for auditions, 51 this year.

In addition to the script highlighted by Melvin (thank you!), there are others from Lazy Bee which may fit the bill.  See this long list (though some of those will not be exact fits to your needs).
We also have another version of Wizard of Oz (However, when considering the Wizard it is always worth asking yourself whether you want to do it because of the songs from the MGM musical - if you do, then you have to use that version of the script and no other).