As you know, a great deal of work (do) ______________ on the psychology of learning so far.
举一反三
- Do you know Mr. Wang will __________ work in our college?
- Great changes _________ in the city, and a lot of factories ____________ so far.
- How much do you know about the works of great _______ figures?
- Do you know the reason he got so angry yesterday?
- The boss was in a temper. Do you know _______ made him so angry?