=>
5. They have visited this college three times.
6. The British Council has been using IELTS as an international standard test of English for non-native English language speakers for a long time.
7. She has been doing her research project since last month.
8. The university has been building a new campus since May.
9. The graduate students have all arrived at the lecture hall.
10. Mary has been staying at a homestay during her undergraduate programme for three weeks.
