【单选题】十进制数(101)10转换为八进制数,下列正确的是( )。
【简答题】When she heard that the tickets had been sold out, she was d______( 失望 ).
【单选题】She felt really bad when she realized that she had lost her watch. It wasn't expensive but it had sentimental______.
【简答题】算一算. 19×8≈ 71×8≈ 897×4≈ 571×3≈ 47×5≈ 213×8≈ 199×7≈ 145×4≈