Since Jack was laid off from his job three months ago, hea new one, but without luck

I left home, my mother taught me ________somesimple dishes, such as noodles and garlic with vegetables

_____ is believed that Bell invented the first telephone in1876.

下列各句中没有语病的是（ ）

ding to scientists, our mental abilities begin to _______ from the age of 27 after reaching the highest level at 22．