Which is the biggest number of the four—_________.

We must work hard to ________ a good knowledge of English.[ ]

stars from the entertainment industry, such as Ke Zhendong and Fang zuming, have recently been arrested, which shows that drug taking is becoming _____ increasingly serious threat to society.

I am considering ______ a nurse after I leave school, which is considered ______ “ an angel in white”.

It was a red light, William. You________ the car.——- Sorry, I didn’t see it.