Directions: Complete the sentences with the correct form of the expressions in the box.burst into regardless of sign up for end up as long as51. We would gather in the campus courtyard for lunch and socializing on Sundays, ________ the weather.52. She missed her bus and ________ walking to campus, enjoying the morning breeze and scenery.53. Instead of idling away your time and doing meaningless things, you might as well ________ some volunteer work.54. ________ you are happy and content, it doesn't matter what you do for a living.55. During the lecture, a group of students ________ laughter at the professor's unexpected joke.

51. 句中“regardless of”表“不管”，修饰“the weather”，完整句为： We would gather in the campus courtyard for lunch and socializing on Sundays, regardless of the weather. 52. “end up”表“结果是”，后接“walking”，完整句为： She missed her bus and ended up walking to campus, enjoying the morning breeze and scenery. 53. “sign up for”表“报名参加”，完整句为： Instead of idling away your time and doing meaningless things, you might as well sign up for some volunteer work. 54. “as long as”表“只要”，完整句为： As long as you are happy and content, it doesn't matter what you do for a living. 55. “burst into”表“突然……”，“burst”过去式仍为“burst”，完整句为： During the lecture, a group of students burst into laughter at the professor's unexpected joke. 答案： 51. We would gather in the campus courtyard for lunch and socializing on Sundays, regardless of the weather. 52. She missed her bus and ended up walking to campus, enjoying the morning breeze and scenery. 53. Instead of idling away your time and doing meaningless things, you might as well sign up for some volunteer work. 54. As long as you are happy and content, it doesn't matter what you do for a living. 55. During the lecture, a group of students burst into laughter at the professor's unexpected joke.