I remember________you sometime at the school gate last week.You are Mr.Chen.
---Do you know how to use this word? ----Sorry, but why not _______in the dictionary.
Doctors advise us ________masks on such hazy days.
----Who _____the good idea at the meeting? ----Tom did.
---Tom, did you go to Sally’s party yesterday evening? ----No, because I _________.
The foreigners find _____difficult to learn Chinese well.