Have you been to the Great Wall? —Perhaps not in my memory. ________, it might have been during my early childhood.

Don’t worry. The plane ______ at 8 a.m. There is still time left.

It was 10 years of hard work that _______his success in business．

I like to have friends who are different _____me.[ ]

Don’t forget to ______ the lights and the TV in the sitting room before going to bed.