根据句意，用括号中所给单词的正确形式填空。
【小题1】All the homeless children are looked (look) after well.
【小题2】I’m not certain (certainly) whether I can do it.
【小题3】We have decided not to go, though it was difficult to decide (decide).
【小题4】I’ve two knives (knife). I use them to cut watermelons.
【小题5】When I visited them last night, they were chatting (chat) by the fire.
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解析：
【小题1】考查被动语态。所有的无家可归的孩子都得到了很好地照顾。主语是动作的承受者，故用被动语态。故填are looked。
【小题2】考查形容词作表语。am是系动词，后跟形容词作表语。故填certain。
【小题3】考查固定句型。It is+形容词+to do sth“做某事怎么样”。故填to decide。
【小题4】考查名词的复数。以f或fe结尾的可数名词，要变f或fe为ves。故填knives。
【小题5】考查时态。根据句意可知，应该用过去进行时。故填were chatting。