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Упр.3 
1) He teaches
2) He makes experiments
3) He treats
4) He treats teeth
5) He writes
Упр.4
1) Did your friend enter...?
    Your friend didn't enter...
2)Does she take her...?
   She doesn't take her...
3) Will he become...?
   He won't become...
4) Does he get...?
   He doesn't get...
5) Did she interested...?
   She wasn't interested...
6) Do they work...?
   They don't work...
Упр.5
1) women
2) child
3) live, men
4) foot
5) teeth