Experts are trying to work out a plan to deal with the problems caused by global warming _________ it is too late

She said that she would do _______ she could __________ her daughter laugh.

(2014·徐州高三模拟)When she heard her son had been admitted to a key university，words couldn’t ________ her excitement.

Not only I but also Jane and Marytired of having one examination after another.

_____　in the front row at theceremony, our distinguished guests are from home and abroad.