1.the traffic in Shanghai is heavier than ____ in Hangzhou

1.the traffic in Shanghai is heavier than ____ in Hangzhou
A.the one B.those C.that D.it
2.I ran ___ than MAria in the 400 metre race.
A.much fast B.much faster C.more fast D.more faster
3.___ easy way it is memorize the words!
A.What B.What a C.What an D.How