规定记号“⊗”表示一种运算,即a⊗b=ab+a+b2(a,b为正实数),若1⊗k=3,则k=( )
2017年3月31日,国务院总理***主持召开国务院第七次全体会议,决定任命________为香港特别行政区第五任行政长官。( )
— I haven't heard ______ Peter yet.
— Don't worry. No news is good news. His letter will arrive soon.