－Have you known Dr Jackson for a long time?－Yes，since she         the Chinese Society．

(2013·高考浙江卷)During the last three decades，the number of people participating in physical fitness programs ________ sharply.

--Do you want a lift home?---It’s very kind of you, but I have a much late in the office. I overslept this morning because my morning clock _______.

---Did you ask Sophia for help?---I ______ need to – I managed perfectly well on my own.

— Hello, I _______ to ask if I can book two tickets for tonight’s film.— Sorry, we’ve already sold out.