It's not polite to s_____ your chopsticks into your food

It's not polite to stick your chopsticks into your food.
把筷子插到食物当中是不礼貌的（行为）.stick sth.into sth.意为“将某物插入某物”.
Bill is calling a friend called Tom now.
比尔现在正在给一个叫汤姆的朋友打电话.因为有now这个时间状语,表示动作正在进行,所以谓语用现在进行时；a friend called Tom 是过去分词作定语,兼有被动的意思,修饰“朋友”,意即“一个叫（被称作）汤姆的朋友”.
We look with our eyes.
这里“看”不用see的原因是see强调“看到”这个意思,注重结果,比如I see you.我看到你了.而look强调“看”这个动作.
Thank you for offering me some tea.
谢谢你给我提供茶.offer表示“提供,供给”的意思.
The boy's success pleased his parents.
男孩的成功让他的父母很高兴.从句子意思上判断是要填一个“让父母高兴”意思的词,p开头的就是please比较合适.除了最常用的“请”意思外,该词也可用作动词表示“让……高兴”的意思.
The word “stick” begins with “s”.
单词“stick”以“s”开头.这句话应很好理解了.