我经常帮妈妈打扫卫生 I often help my mother ____ ____ ____. 汤姆正在学用筷子吃饭 Tom is learning to eat ____ ____. 他一到这儿就来看我 He came to see me ___ after he ____. 在北京大学读书是很幸福的 It's ____ ____ ____ in Beijing University.
I often help my mother do some cleaning./clean the house Tom is learning to eat with chopsticks. He came to see me at once after he got here. It's happy to study in Beijing University.