Answer from cs61c-es (Meng Chang Bruce Lin 16075852) for Question 2
For C:
if-else, if-else if, switch statement,
Bitwise operator (&,|,^,~),
relational/logic (>, >=, <, <=, == !=),
conditional exp1 ? exp2 : exp3

For MIPS:
bne, beq, slt, slti, sltu, sltiu

The reason that MIPS has fewer insturctions is to keep things small and simple. By doing so, smaller instructions result faster calculation.