The first textbooks______ for teaching English as a foreign language came out in the 1 6th century.
Since your English is poor, why not ________ an English club to improve it?
I think that's unlikely to happen, but if that_______, both America's and China's interest would be severely damaged.
One _____ of being able to speak English is that you will have more job opportunities.
---He lost his job last week, but he seems happy. ---I think he _____ to put on a brave face.
The sick salesman was happy to stay at home because doing _____ was a thorough rest for him.