#1) Two peaks the methyl is a singlet and the CH2 is also a singlet because of symmetry (even though n+1 would look like a triplet they are equivalent Hs and dont split)
#2) 2 singlets
#3)Methyl will give a singlet, There is an H (not shown) at tertiary position that will show a multiplet, and the 4 Hs on the ring (all equivalent) will show a singlet