My wedding ring ________ of yellow and white gold.

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 31 to 35.
Deep brain stimulation (DBS), an experimental technology that involves implanting a pacemaker-like device in a patient’s brain to send electrical impulses, is a hotly debated subject in the field of medicine. It is an inherently risky procedure and the exact effects on the human brain aren’t yet fully understood.
But some practitioners believe it could be a way to alleviate the symptoms of depression or even help treat Alzheimer’s — and now they suspect it could help with drug addiction as well. In a world’s first, according to the Associated Press, a patient in Shanghai’s Ruijin Hospital had a DBS device implanted in his brain to treat his addiction to methamphetamine. And the device has had an astonishingly positive effect, the patient says. “This machine is pretty magical. He adjusts it to make you happy and you’re happy, to make you nervous and you’re nervous,” he told the Associated Press. “It controls your happiness, anger, grief and joy.”
Other studies in China have yielded mixed results trying to treat opioid addictions using DBS, according to the AP. In the United States, at least two studies that tried to treat alcoholism with DBS were dropped for not being able to justify the risks. The idea of using DBS to treat drug addiction has raised concerns in medical communities across the globe about brain hemorrhage, seizures, or personality changes.
What is the passage mainly about?

In some communities a husband's ________ over his wife is absolute.

The more polluted air we breathe, _________ we get.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.
Sport and sport events provide a significant source of volunteering opportunities for a wide range of individuals. (26)_________ organizers of major sport events tend to target the youth market to source volunteers due to the apparent high level of interest in sport by this group, not only in terms of young people who watch a particular sport, but also those (27)_________ participate in it. It is therefore suggested that sport may act as a kind of ‘nursery’ for volunteering and that the experiences (28)_________ to young people in sport may be critical for their future volunteer involvement, not only in sport but the broader society. By developing an interest in volunteering as a young person, it is hoped that these people will continue to volunteer as they become adults. One of the most common approaches by many event organizers is to place an advertisement in the local media which invites readers to contact the organization. (29)_________ , it is possible to adopt a more formally structured recruitment programme through schools and universities. The (30)_________ of this approach is to establish a relationship between the governing body of a particular sport and young people from an early age, in the hope that young people who are either spectators or participants in the sport continue from childhood to adulthood.