At the request of some English learners, he has published a lot of books, one of _______ is about English idioms.
When we worked in the same office, we _____ often have coffee together.
—Where do Dr. Kleitman and his assistant come from?—I’m not sure, but their English _____Australia.
The novels written by the author sell best, but five years ago no one could have imagined how great a role he _____in the literary world.
____teacher of my grandmother’s is coming the day after tomorrow. I’m wondering how old____woman she should be.
The machine has been used many years_____ it doesn’t work well occasionally.