选错.改错。下列各句画线部分均有一处错误，请找出，将其字母序号填入题前的括号内，并且在横线上改正。（1）（2）（3）（4）（5）
( ) Even the top students in our class can’t work out this problem. So it _____ be very difficult.
() This machine is very easy to use.______ can learn to use it in a very short time.
( ) One of his friends ______ his daughter sometimes.
( ) The game is _____ funny that many of them like it.
( ) Are there _____ trees behind the house?
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