The following chapters provide step-by-step instructions for practical _______ of genetic (基因)engineering to agriculture.

Which sport are you in at the school sports meeting? –No decision yet. I think it ______after discussing with my PE teacher, Mr. Yuan.

The teachers often tell their pupils _____ across the road when the traffic light is red.

Neither my wife nor I myself______ able to persuade my daughter to change her______.

He helps his parents _____ the housework. [ ]