1.The little boy didn't go far.He was playing b___his house.
问题描述：
1.The little boy didn't go far.He was playing b___his house.
2.The man put a m___ on the tree in case of getting lost in the forest.
3.The k___ is not sharp enough to cut the meat.
4.Gary gave her mother a k___ to express her deep love to her mother last night
答
1.behind/beside
2.mark
3.knife
4.kiss