Wang Ming, our English teacher, has a good ______ of French; that is because he once studied in Paris.
After completing and signing it, please return the form to us in the envelope ________.
_______the Teachers’ Day ,the students are cleaning the classroom.
I need to get another dictionary, because cover is dirty and page is missing.
My book, The House of Hales, is missing. Who ________ have taken it?
The young couple, who returned my lost wallet, left _______ I could ask for their names.