This new teaching approach is specially ______ to develop children’s problem-solving skills.
The man was a stranger in the city and the police had no clue to his _____________.
Plan your activities so that you are rested and refreshed when something important ______.
Nobody noticed he entered the room because the lights _________________ burst.
Please call the station to make sure when the earliest train ______________.
--- Don’t forget to turn to me if you have any trouble. ---- __________________.