I have a lot of readings________before the end of this term.
--May I put my bicycle here?-- Yes. But you should always keep it ________, in case it is stolen.
News has been put forward ________ more middle school graduates will be admitted into universities.
The reason why he didn't come to school was ________ he was ill.
Does ________ matter much if they do not come tomorrow?
The bell ____ the end of the period rang and we had to stop our discussion