汉译英求助~~~~好心人帮帮忙...

汉译英求助~~~~好心人帮帮忙...
有点算点,多的给分~~~好的追加分~~谢谢
16.这行不通,首先,所需时间太长.其次,花销太大.
It won't ________.To ________ ________,it would take too long,and ________,it would cost too much.
17.俗话说“礼轻意重”,我更愿意接收那些能表达心意的礼物.
We have a ________:"it's the ________ that ________". I prefer to receive a gift has some thought ________ it.
18.没有人能阻止中国人民变成一个富强的国家.
Nobody ________ ________ the Chinese people ________ ________ China a rich and strong country.
19.必须采取措施保护树木.
Something must ________ ________ ________ ________ trees.