—Some Chinese students find it difficult to understand native speakers when in London—Exactly,___they’ve learned a lot about grammar and known many words
Professor Liu has ________ teach psychology since he came to the Central China Normal University.
----Any news about Bill Clinton? ----He left power three years ago and has a little now and a little then been ______.
If you want to sell your product you must _____ it.
—Shall I open the window to let some fresh air in?. —No, ______.
Someone called me up in the middle of the night, but they hung up ______ I could answer the phone.