--- Has your brother returned from America yet?
--- Yes, but he ______ here for only three days before his company sent him to Africa.

The rest of the apple _________.

______ the plan means we must start from the very beginning.

_______ , the girl worked in a hurry.

Either the ways or the time ____ yet, but you may ask the headmaster for some information．

—Those scientists invented a robot to care for kids!
—It’s not surprising．They ____ wonders all the time．

My father told me that we wouldn’t go anywhere this summer holiday if I ___pass the examination.

She didn’t come to school yesterday .Do you know what ___her?
has happened with  B. had happened with  C. had happened to  D. has happened to

---Each of the students working hard at their lessons ________ the book.
---- So have I.

--- I let my secretary call you several times. Do you know that?
---- I _______ in a meeting. I’m sorry.