Lesson 17-2 A man-made disease It effectively spread the disease all ove...

Lesson 17-1 A man-made disease In the early days of the settlement of Au...

Lesson 13-1 The search for oil The deepest holes of all made for oil, an...

Lesson 13-2 The search for oil The geologist needs to know what rocks th...

Lesson 4-1 Seeing hands Several cases have been reported in Russia recen...

Lesson 12-1 Banks and their customers When anyone opens a current accoun...

Lesson 11-2 How to grow old An individual human existence should be like...

Lesson 11-1 How to grow old ˈlɛsn 11-1 haʊ tuː grəʊ əʊld Some old people...

Lesson 9-2 Royal espionage Alfred stayed in the camp a week before he re...