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. 

My son really hates Math. Its complicated formulas are the reason.

She'll start exercising __________ .

The woman ____________ about her son’s travelling because there is so much traffic on the narrow and crowded way to school.

Mary met her second husband not long after her first marriage __________.

The __________ time was a charm for Korea’s Pyeongchang 2018 Winter Olympic bid committee.

- “What did the meeting discuss? I didn’t attend it because of traffic jam.”

- “______________”

The fact that space exploration has increased dramatically in the past thirty years indicates that we are very eager to learn all we can about our solar system.

You are ________ only person whose opinion is of any value to me in the present regrettable circumstances.

The new shopping mall __________ next month and a grand opening ceremony is being planned.

Removing one's footwear before entering a home or a temple before worship _______ a sign of respect, humility, and submissiveness.

Americans believe in 'romantic' marriage - a boy and a girl are __________ to each other, fall in love, and decide to marry each other.

Language belongs to everyone, so most people feel that they have a right to ______ an opinion about it.