The new CRH train between Beijing and Shanghai _______ speed can reach about 380km/h will benefit people a lot.

The light in his office is still on. Do you know __________—To prepare for the mid-term exam.

I began to feel ________ in the new school when I saw some familiar faces[ ]

Modern science has given clear evidence ________ smoking can lead to many diseases.[ ]

In the 16-19 age group，1 of women smoke ______ 8 of men.