1(a)
Victor Klimov has shown that by shrinking the elements of a solar cell down to a few nanometres, or millions of a millimetre, each captured photon can be made to generate not one, but two or even more charge carriers.
1(b) Now please correct the mistake that was contained in the sentence above. What should the correct form be? Do not type the whole sentence, just the highlighted passage once you've corrected the mistake.
2(a)
"Overall, HIV incidence believed to have peaked in the late 1990s and to have stabilised subsequently, notwithstanding increasing incidence in several countries", UNAIDS said in its report, Report on the Global AIDS Epidemic.
2(b) What should the correct form be?
3(a)
Black holes of various masses are thought to have sprung to existence within one second of the big bang, as elementary particles clumped together at extreme energies.
2(b) What should the correct form be?
4(a)
Type 2 diabetes, arises when insulin-producing cells in the pancreas fail to make enough of the hormone, or cells in the body become resistant to its influence, causing sugar blood levels to rise.
4(b) What should the correct form be?
5(a)
Weather inhaled ozone contributes to heart disease via these mechanisms is unknown, but Wentworth says it is possible that ozone from the air could form atheronals in the lungs, and these could then make their way to the arteries.
5(b) What should the correct form be?
6(a) A new smart material used to make "haptic sports gear" contains actuators capable of given football players a gentle push during training. This could tell them when they are practising incorrectly and even let them know which muscles they should be exercising.
6(b) What should the correct form be?
7(a)
Coal provides more than half of the American electricity supply. Because coal's energy comes from oxidizing carbon, coal makes more carbon-dioxide than any other source of electricity -- and nevertheless has the biggest global-warming punch.
7(b) What should the correct form be?
8(a) US investment bank Lehman Brothers is looking to recruit an extra 2,000 staff after a strong rise in profits.
Lehman made a second quarter pre-tax profit of $1.49bn.
Despite of the strong results, Lehman's shares fell sharply on concerns that its profit growth may have peaked.
8(b) What should the correct form be?
9(a)
Increasing the level of HDL ("good") cholesterol by itself is enough to reduce cardiovascular risk in certain people, according to a report from Scotland.
Researchers found "evidence of an independent benefit of raising HDL, but for some reason it was only clearly seen in those without established cardiovascular disease and those who took lipid-lowered therapy."
9(b) What should the correct form be?
10(a)
A transporter that silence one of the body’s natural pain killers holds promise for new powerful, non-addictive pain medicines as well as understanding AIDS patients’ increased pain perception, researchers say.
10(b) What should the correct form be?