Choose the correct tense of the verbs in brackets to complete the following sentences. 1. The door is open. Who _____________ it? (has opened / had opened) 2. We will wait here until you ________________ the letter. (have finished / had finished) 3. Three years ____________ since we left school. (has passed / had passed) 4. I ________________ of him as a rather unimportant poet till then. (had always thought / have always thought) 5. He said that great changes ________________ in his hometown since 2003. (have taken place / had taken place) 2. Complete the following sentences with the correct tense of the verbs in brackets. 1. He ___________ (learn) some English before he came to the university. 2. By the time I read his new book, I ___________ (know) him for a long time. 3. The lift ___________ (break) down. So we have to climb upstairs. 4. Many Westerners ___________ never ___________ (see) a giant panda. 5. He ___________ (want) to come forward and defend his friend, but his brother held him back.