schreibe morgen arbeit und wäre wichtig zu wissen ob ich hier in diesem text richtig entschieden hab ob aktiv und passiv und in welcher zeit. Falls Fehler könnte sie jmnd verrbessern&erklären?

Silicon Valley isn't be (not be) a valley at all but is (make up) of a number of cities in the southern part of the San Franciso Bay Area in Nothern California. The largest was (be) San Jose. Other important ones are (be) Cupertino, Mountain View, Palo Alto, Santa Clara and Sunnyvale. Silicon Valley knows (know) as the most important area of high-tech innovation in the worl. The area was given (give) the name Silicon Valley by a California businessman, Ralph Vaerst. The name was first published (first publish) in 1971 by Don Hoefler, a friend of Vaerst's, who worked (work) as a reporter. he used (use) the name in some articles on the new computer industry. It was first call (first call) Silicon Valley because of the area's large number of companiens that maked (make) silicon chips for the computer industry. Nowadays it usually just have been meant (mean) the hightech industry in the region. And the hightech companies which have (have) thei head offices in Silicon Valle are read (read) leike an A-Z of the hardware and software industries: Adobe,Apple and Yahoo! All of them can found (can/find) in Sil