Task 5 Questions 21-25 Read the text below. For each question (21-25), choose the answer (A,B or C) that best completes the sentence. Mark your answer on the answer sheet. There is an example at the beginning ( $\mathbf{0} \rightarrow \mathbf{C}$ ).
Painted Ladies You may not know it by name, but you (0) ______ certainly recognise a Painted Lady butterfly at the beginning of summer. But what many people do not know is that when these remarkable creatures arrive (21) ______ their European destinations each year, on occasions forming vast balls in the sky visible from the ground, they have travelled thousands of kilometres from Central Africa, where the species spends the winter. Yet more remarkably, the journey is actually made by several generations moving northwards, a fact established by scientists who used forensic techniques to determine where individual specimens (22) ______ grown up. Until recently, however, it was not known (23) ______ the Painted Lady returned to Africa at the end of summer or simply died with the beginning of cold weather. A mass survey in 2009 across Europe provided the answer. It was discovered that the butterfly did (24) ______ return to Africa; however, the flight was made at a height of 500 metres above the ground, (25) ______ advantage of favourable winds to reach speeds of nearly $50 \mathrm{~km} / \mathrm{h}$. The distances covered are immense - up to 15,000 kilometres - and the individuals that eventually arrive in Africa can be up to six generations later than those that began the southward trip.
21) When the butterflies arrive ______ their European destinations each year, on occasions forming vast balls in the sky visible from the ground, they have travelled thousands of kilometres from Central Africa, where the species spends the winter.
22) Scientists used forensic techniques to determine where individual specimens ______ grown up.
23) Until recently, it was not known ______ the Painted Lady returned to Africa at the end of summer or simply died with the beginning of cold weather.
24) It was discovered that the butterfly did ______ return to Africa; however, the flight was made at a height of 500 metres above the ground.
25) The flight was made at a height of 500 metres above the ground, ______ advantage of favourable winds to reach speeds of nearly $50 \mathrm{~km} / \mathrm{h}$.
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