Write the subordinate conjunctions of each sentences

Question

1-We drove home carefully,because it was snowing. sub is( because)

2-We had classes until noon although the weather was bad. sub(until, although)

3-If the snow is deep enough, there will be no school tomorrow.sub (if,enough)

4-School is closed only when the snow is deep.sub(when)

5-Where Lisa and Marco live, there are usually two deep snows every year.sub(where)

Answer 1

2 and 3 only have one subordinate conjunction in each.

The rest are correct.

Answer 2

In number 2 although is a subordinate and until because in list they include both
so which one I choose

Answer 3

Until is a preposition in this sentence. It begins the phrase "until noon."