I think I was at school,______I was staying with a friend during the vacation when I heard the news

I _____ have written to him because he phoned me shortly afterwards.

swas alone at home, with lookingafter him

Hiking is _____ great fun. You will get close to ____ nature and take exercise at the same time.

Mary once taught English in a remote village school as a volunteer, which is ________ only on foot.