The robot needs _______ once a month. And we will check it for you for free.

．—Weflew to Egypt for the holiday and we all had a wonderful time.—_________.

Though there are some differences in American and Chinese education, both systems are ________ excellent graduates. [ ]

With the fast development of computer and Internet technologies, traditional printed books ______ by the growing popularity of online reading of e-books

The town is no longer ________ it was ten years ago.[ ]