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Todas las actividades
Jugar Test
1. 
Could you tell me if it is necessary for me to bring a sleeping bag? (HAVE)
2. 
You mustn't use a personal stereo on a plane. (ALLOWED)
3. 
He has to give me the money back. (obliged)
4. 
You mustn't wear dark-soled shoes in the gym. (SUPPOSED)
5. 
It wasn't necessary for you to bring all those books. (HAVE)
6. 
These exercises should be continued for six weeks (MUST)