1. The present given to me last night must have been very expensive. 2. Claire Baktne, born in 1843, was a true representative of the hopes of hundreds of immigrants. 3. Frequently, computers considered obsolete at large companies are donated to charity institutions orcommunity centers in poor neighborhoods. 4. The mall built in the downtown area of the city has affected traffic considerably. 5. The children selected for the team will start training in a couple of weeks. 6. The new construction company promises to hire all the engineering students graduating from MIT by the end of next year.7. Alexander G. Bell, considered the inventor of the telephone until recently, simply obtained the patent that belonged to an Italian inventor.8. The stamp on that envelope is a rare collector's item mng cứu em với ạ