Complete these sentences with am, am not, is, is not, are, are not. 
1. jeffrey lmmelt........... the CEO of GE.   
2. Buenos Aires............in Argentina. 
3. Siemens and BMW...........German companies
4. l.................English. 
5. lsabel and juan.............two technicians from Mexico. They speak Spanish, but they.................... from Spain! 
6. Nissan............ an American company, it.............japanese.
7. l..................... interested in Business English.