Mr.Green gave us some advice about _____ _____ _____ (提高我们的英语) yesterday

Mr.Green gave us some advice about _____ _____ _____ (提高我们的英语) yesterday
How long have you _____ _____ _____(学习中国历史)?
When I leave school I'll _____ _____ _____(考虑成为 an English teacher ___ ___ a tour guide