_____ the Hope Project started, it has helped thousands of students return to school.
此题考查介词的用法。此题意：自从希望工程开始以来，已经成帮助了成千上万的学生返回学校。since自从，before……之前，when当……时候。
Hospital doctors don`t go out very often as their work ____all their time.
We designed the machine _____the purpose _______production.
He didn`t go into detail on the subject ,he spoke ______.
I _______ by his story that he made up.
As you know, whether the person will be elected president is matter of ___interest.
He started early _______he could get there before nine.
I am all tears, ____,I am listening to you with all attention.
_______, my brother passed the exam.
They were still _____their friends after their child`s long illness.
