As the immune system weakens, it loses the ability ________ illnesses.
The old men can hardly imagine that they can live in an age _______ most of the daily things are done on the computers.
The guests are looking forward every moment to _______ to China again.
Many students don't want themselves to _______ doing _______ homework.
—English has a large vocabulary, _______?—Yes. Know more words and expressions and you will find _______ easier to read and communicate.
Hong Zhanhui never gives up trying. It is the love and responsibility _______ has driven him to go through hardships and survive in life.