Tom and Mike are good friends. They are good with children. They want to find jobs in summer vacation. This Friday Tom tells Mike that Sunson School Trip needs teachers to help with sports, music and computer. Mike is glad to know that.
    Tom can play basketball, volleyball, and he can swim. Mike can play the violin, the trumpet, the drums and the guitar, and he can swim,too. Tom and Mike like computers very much. Can they join Sunson School Trip?

把多项式a³+2a²b+ab²﹣a分解因式正确的是（　　）

We'll visit the Big Ben in London. ( 改为一般疑问句 )

${}_{86}^{222}$ Rn、 ${}_{86}^{219}$ Rn是（   ）

把下面的句子改为“被”字句。

人们纷纷把钱交到她手中。