写英语同义词
1.what is certain is that the mystery hasn't been explained fully.
______ is certain ______ the mystery hasn't been explained ____.
2.he told me the next day that he met my friend not long after he arrived at the hotel.
he told me the _______ day that he met my friend ____ after he _____ the hotel.
3.he didn't feel well,so we asked him to see the doctor at once.
he ____ ____ ,so we asked him to see the doctor ____ _____.