1.account
I have an account with the bank. 我在銀行開有戶頭。
He turned/put his knowledge of Spanish to good account. 他善加利用他對西班牙語文的知識。
Don‘t stay away on account of John. 為了約翰,不要離開。
2.act
Don‘t take him seriously —— it’s just an act. 不要把他看得太認真 ——— 他只是假裝那樣而已。