Ex:Chia động từ trong ngoặc
1.Why didn't you want to watch the film?.....(you/see) it before?
2.By the time Alex finished his studies,he (be)..... in London for over eight years.
3.He(visit)..... Paris three times this year.
4.During our conversation,I realised that me(meet)....... before.
5.The zoo isn't far from here.I .....(walk)there many times.