that is why they have to stay in cages 这句话怎么来解答它?

that is why they have to stay in cages 这句话怎么来解答它? 英语选择,两空That's ( ① ) they have to stay in cages.But I don't t some animals are dangerous.that's( )they( )stay in cages A b they have nothing to do every day ,so they walk in the cages 英语的一个首字母填空The Beck Zoo is in Canada.They d_____ have cages.T The animals are tired.But now they have to s____ in cages or Tigers,bears and some snakes are( ),that is why have to stay That's why she is eager to help others when they are in need the students have to stay in the classroom,_______ they? It is raining______ ,so they have to stay at home oh,it is raining so hard that we have to stay indoors.怎么知道we They have made up their mind to stay in Britain.They have ma