At the age of 29, Dave was a worker, ________ in a small apartment near Boston and ________ what to do about his future. 

—Come on, please give me some ideas about the project.—Sorry. With so much work _______ my mind, I almost break down.

(2013·江西南昌两校一模)A world­shocking shooting rocked a school in the US, ________ twenty children and eight adults dead.

___ nice, the food was sold out soon.

In April , thousands of holidaymakers remained ______ abroad due to the volcanic ash cloud.