1. Four countries ______________ (visit) by John so far. 2. London ______________ (have) a population of eight million people. 3. The Statue of Liberty in New York is a monument which ________ (symbolize) freedom. 4. Vietnam’s Independence Day ________________ (celebrate) on September 09th. 5. We ______________ (visit) Sydney Opera House for several times. 6. Some activities ______________ (prepare) to celebrate the lunar new year now