--Why are you so anxious? --It isn’t your problem ____.
When Peter speaks in public, he always has difficulty ______ the right things to say.
As Jack left his membership card at home, he was forbidden ______into the sports club.
Soon children in the camp had many friends, _______ they shared food, stories and projects.
All the neighbors admire the family _______ the parents are treating their child like a friend.
The manager is still on _______ vacation, so I will be in _______ charge of the meeting today.