1. a computer. (the adams bought a computer.) 2. they have. they have already met mr smith.) 3. they met mr smith when they were in london. 4. they are. (they are going to there again). 5. english. she teaches english. 6. travelling. (he was interested in travelling.) 7. they do. (they have to get up early.) 8. at the airport. (he had to meet them at the airport.) 9. the baby's room. (mary has to clean the baby's room every morning.) 10. boots. (they have to wear boots.)