At business cocktail reciptions，hold your drind in your（）hand.

A.Using the knife to cut it.
B.Using the table utensils to eat it.
C.Using fingers to break it.
D.Using the spoon to crumble it.

A.nose
B.face
C.forehead
D.mouth

A.before contract or confirmation is signed by buyers and sellers
B.when the buyers want to open a letter of credit
C.when the buyers and sellers finished the transaction
D.after contract or confirmation is signed