5．
（1）The girl is _________(盯着) at the strangers with her eyes wide open.
（2）It’s good m__________ to say goodbye to the host when leaving.
（3） The reason he gave to _____________(说明) for his absence was unbelievable.
（4）They rushed to the s_________ of the accident.
（5）It’s _________(不像)him to be late; he’s usually on time.
（6）Not all people are aware of the various effects g_________ warming.
（7）Some believe in the __________(存在) of life on Mars, while others consider it as a myth.
（8）Everyone was a bit __________(迷惑的) by her sudden departure.
（9）I consider that it is h_________ for students to play computer games, though some of them don’t think so.