1. The professor provided me with a lot of tips for my papaer, -------- was quite unnecessary.

a many of which

b many of them

c much of which

d much of what

정답은 c인건 알겠는데, which 말고 them 을 쓰면 안되나요??

2. The theory of Adam Smith is that, ------- intact by government, competition in the market will bring benefits to the greatest number of people.

a were left

b if left

c if that's left

d it is left

정담은 b인데 그 이유를 잘 모르겠어용..

3. By and large, the first half of our youth ----- studying, and the other half by constantly working.

a are spent

b were spent

c become spent

d is spent

답은 d이고 해설보면, spend의 목적어인 시간이 주어로 나왔으므로 수동형으로 쓰고 the first half에 맞춰 단수동사가 와야한다고 했는데, spend의 목적어가 뭐고 왜 the first half 뒤에는 단수동사가 와야하나요??

텝스 선배님들 제발 가르쳐 주세용ㅠㅠ