Please help me to answer the following sentences about the reason why this is wrong or right.Thank you!

T A corporate bond selling at a premium to its face value implies that it has a negative promised yield-to-maturity. T F 9. A risk-free government bond with an infinite time to maturity will have an infinite modified duration. T F 10. An increase in the uncertainty about the growth rate of a company's future dividends will lead to a lower expected intrinsic value per share today.T F 4. In the context of binomial option pricing model of valuing a firm's equity and debt, an increase in the maturity of debt will lead to a lower value of the firm's debt