— John seems happy, even though his wife left him and he lost his job. — I think he __________ to put on a brave face.
He is more than happy to keep you ____ company, which is just out of _____ question.
---Shall we go to the art exhibition right now? --- ____________.
—He failed in the exam again. —He __________his teacher’s advice.
When first to the market, these products enjoy great success.
It is uncertain ______ side effect the medicine will bring about, although about two thousand patients have taken it.