I really don’t know ______ I had my wallet stolen.
The teacher told the monitor to ______ all the students' names who were absent from class.
John may phone tonight,I don't want to go out ______ he phones.
He is always helping people without expecting anything ______.
I will mark ______ everything you say.It is helpful to the English learners.
—Believe me,all your efforts will ______ some day. —Thanks for your encouragement.