SARS is an illness that can result in death unless left      in time.

The housing problems we are looking forward to seeing _______ have attracted the government’s attention.

Any opportunity should be made ______ of _______ your spoken English.

 The old black woman used to tell stories under the tall tree, her grandchildren ______ around and ______attentively.

Distinguished guests and friends, welcome to our school, _____the ceremony of the 50th Anniversary this morning are our alumni （校友） from home and abroad.