According to scientists, our mental abilities begin to ___ from the age of 27 after reaching the highest level at 22.
---Thanks a lot for your offer. I found it very helpful. ---____. I’m glad you benefited from it.
--- Shall I go over to have a chat with you this evening? --- Nice of you! It is ____ great comfort to keep me ____ company, when I’m alone at home.
At the age of 29, Dave was a worker, _______ in a small apartment near Boston and ______ what to do about his future.
When he ______the door, he found his keys were nowhere.
In April, 2009, President Hu inspected the warships in Qingdao,_______the 60th anniversary of the founding of the PLA Navy.