The film shows us ________ in Beijing in the past.

 I can’t understand ____________ the boy alone.

 ---Have you seen Bill recently? --- Oh, no! Nobody knows ______ he is! Everyone is looking for him.

Scientists observe ___ making the most of our senses when we are young can keep us healthy later on in life.

We need a more capable leader, ______ with strong will and as well as good humour.