It ______ six years since they last saw each other.

You get up so early this morning because it’s Sunday today .

hat do you think of genetically modified food (转基因食品)? —We all think ______ is careless ______ some scientists to say it is safe before doing any experiment.

My mom was mad at me last night. What should I do?—Please say sorry to her________.

Johngoes fishing on holiday. He likes staying at home and watching TV.