----This returned Chinese scholar has become one of the top experts in this field.----Yes,I know him very well.He_________in Africa with animals for eight years.
I _____ up early when I was in high school, but now I _____ up around 7:00 am.
What do you think should _____ the shopping list?
The last factory ______ I am going to visit is the place _____ my mother worked five years ago.
The dog, if trained ____, will be made a good watch-dog one day.
The one and only thing I ____ is whether you take a good rest!