$1.$ Choosing only risky projects because the rate of return is much higher than the WACC could ultimately $\_\_\_\_\_\_\_\_\_\_$ the WACC. I think the answer is increase but I$\text{'}$m not sure.

$2.$ If a particular project is relatively risky, then a cost of capital $\_\_\_\_\_\_\_\_$than the WACC should be used. I think the answer is lower but again not sure.