—Have you ever visited the Opera House?
—Yes．When I was in Sydney, I__ _it twice．
| A．had visited | B．visited | C．have visited | D．would visit |
The atmosphere of the earth ______ us from the strong sun light.
| A．prevents | B．keeps | C．stops | D．protects |
Don’t disturb me. I_______ letters all morning and have written ten so far.
| A．have written | B．am writing | C．was writing | D．have been writing |
All his friends and relatives came to ______ him on his daughter’s being admitted to Qin Hua University.
| A．celebrate | B．congratulate | C．memorize | D．respect |
_______Barbara Jones offers to her fans is honesty and happiness.
| A．Which | B．What | C．That | D．Whom |
She is so________ to Korean soaps that recently she began to study Korean.
| A．addicted | B．anxious | C．crazy | D．interested |