All your sentences make sence but not as same as your English sentences.
All your "努力“ should be changed into "试图".
努力 basically means keep trying to do something, try very hard to do something,try it again and again,emphasizes that they've made a lot of effort to do it.
努力 as a noun means effort ：他多年的努力终于得到了回报。 Finally his years of hardwork paid off.
as a verb. meaning make a great deal of effort on doing something 我一定会努力去做的。 Believe me.I will spare no effort to do it.
as a adj. means industrious 她是个很努力的学生。She is a student with industy.
as a adv. means 蜗牛正在努力地往上爬。 The snail is trying hard to climb upwards.