all visitors must -----their -----before ----the gate .所有参观者都必须出示通行证才可进门all visitors must -----their -----before ----the gate .所有参观者都必须出示通行证才可进门

all visitors must -----their -----before ----the gate .所有参观者都必须出示通行证才可进门all visitors must -----their -----before ----the gate .所有参观者都必须出示通行证才可进门
all visitors must -----their -----before ----the gate .所有参观者都必须出示通行证才可进门
all visitors must -----their -----before ----the gate .
所有参观者都必须出示通行证才可进门

all visitors must -----their -----before ----the gate .所有参观者都必须出示通行证才可进门all visitors must -----their -----before ----the gate .所有参观者都必须出示通行证才可进门
all visitors must -show----their -passport----before -entering---the gate