中国大学MOOC: I’m so ______ to all those volunteers because they helped my terrible day end happily.
                    举一反三
- I’m so ______ to all those volunteers because they helped my terrible day end happily. A: superior B: grateful C: special D: unique
 - I’m so ______ to all those volunteers because they helped my terrible day end happily. A: grateful B: special C: superior D: attractive E: unique
 - 中国大学MOOC: My assistant and I are in a meeting all day,
 - 中国大学MOOC: I have been working so hard all day that I really need to ______.
 - My assistant and I are in a meeting all day, A: but you are very near the conference hall. B: so we aren't free. C: so you aren't late. D: but I'm not a salesman
 
