79. Such a grammar mistake is ______ among the beginners of English study.

In order to support the big family, he worked so hard that___________ he made himself ill

24I don’t know if she __________, but if she __________ I will let you know

What kind of noodles would you like — __________.

__________ the displays of culture and technology, the Shanghai Expo also showcased the spirit of voluntarism.(志愿者精神)