Answer:
1. The poet wishes for the world to, in a sense, "shut down" to grieve for the loss of their loved one. For the poet, this person was their North, South, East, and West, they were their sense of direction and their everything. With their loss, "nothing now can ever come to any good", so the poet faces an extreme sense of grief, feeling like this individual was the only good thing in their life. Life now feels pointless, and so they feel that the world's proper response would be to grieve as well.
2. (I am not sure if I understand this question completely, this is my opinion)
Lines 1-8 show things that could happen. Yes, it is possible for a piano to be muffled, it is possible to cut the telephone wire, to prevent a dog from barking, etc.
Lines 13-16 are things that are impossible to happen. You can't "put out" every star in the universe, you can't "pour" out the ocean, "dismantle" the sun, etc.
3. "My working week and my Sunday rest" best describes this closeness. This reveals how this person was a part of everyday life for the poet, how this individial became the poet's routine. The individual is said to be their "working week" and "Sunday rest", meaning that for the poet this person was their lifestyle, they were their life.
4. 'Rose-colored spectacles' is a saying that refers to how when a person is in love everything seems like it will always go right. In this state, a person feels very euphoric, to the point where being in love probably means that there will always be feelings of happinness and joy. However, the poem shows how this is not the case, since being so much in love can result in intense grief if the loved one dies. In this case, being in love has not caused happinness to the poet, but great pain to the point where everything in life is pointless.
