Subway Line 4，into use in September 2009，has made traveling in Beijing easier．

How do you usually go to school—I take a bus, but I walking now.

When I walked past the street, seeing the children playing happily, their happy laughter _______memories of my childhood.

The woman biologist stayed in Africa studying wild animals for 13 years before she returned.—- Oh, dear! She _______ a lot of difficulties!

I’d like to find _________ to read on thejourney, and _________ will do.