——Why should I correct that mistake right now, Mum? It’s OK, I think..——Well, honey, it will _______ big trouble in the future.
--- How do you study English? ---I study English talking with foreign students
--- My son seldom has breakfast. --- It is unhealthy habit.You must ask him to change it.
I am wondering ________ my invitation and join me for the trip to Hainan this summer.
They have discussed the plan for some hours but no agreement ________.
I had waited for several weeks without __________ Sam so I e-mailed him again.