翻译句子

【1】他总是惦记着她。(on one’s mind)

_________________________________________________________________

【2】交通堵塞产生了大量的污染。(a great deal of)

_______________________________________________________________

【3】即使失败10次，我也不灰心。(lose heart)

________________________________________________________________

【4】她经常改变主意。(change one’s mind)

______________________________________________________________

【5】他的实验一定能成功。(succeed in doing)

________________________________________________________________