【推荐1】The tree ________ is in our backyard provides shade during hot summer days. (用适当的词填空)

【推荐2】While these species are rare north of 88, there is a likelihood________ they range all the way across the Arctic, and as far south as James Bay in Canada. (用适当的词填空)

【推荐3】There is no obvious evidence ________ there is life on any other planet in the solar system. （用适当的词填空）

【推荐1】The reason why he was late was _________ his car broke down on the way. （用适当的词填空）

【推荐2】The reason for their failure you know is ________________ they are lazy. （用适当的词填空）

【推荐3】The question is ________ he has left the area. （用适当的词填空）