用适当的介词填空

【1】It's not easy _____ David to learn math well.

【2】My cousin has the same sweater ___ you.

【3】Jim is better ___ speaking than listening in English.

【4】This coat is different ___that yellow one.

【5】Though he is very young，he can do many things ___ himself.

【6】—Are you as friendly ___ your sister?

—Yes, I am.

【7】Liu Chang did quite badly ____ English，but Zhang Sheng did even worse.

【8】There are many differences ___Mike and Tonny，though they are twin brothers.