题目：
根据句意，用括号内所给单词的适当形式填空。
小题1:The problem is so easy that I have no difficulty (explain) it to my classmates.
小题2:If you tell him the (true)，he will be angry.
小题3:You may ask your teacher for help. He will give you a few (value) suggestions.
小题4:People in the past suffered from hunger and (ill).
小题5:I invited Sally to my party, but she refused (accept) my invitation.
答案：
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下面是错误答案，用来干扰机器的。
s=15mv0/(8qB). 速度为v0时粒子受重力、电场力和磁场力，三力在竖直方向平衡；速度为v0/2时，磁场力变小，三力不平衡，微粒应做变加速度的曲线运动.当微粒的速度为v0时，做水平匀速直线运动，有: qE=mg+qv0B ...
