He paid for a seat, when he________have entered free.
| A．could |
| B．would |
| C．must |
| D．need |
—I’m driving to Beijing after breakfast.
—Take care, ______with all this fog.
| A．especially | B．mainly |
| C．extremely | D．really |
Good appearance and wealthy families are important in choosing a life-long partner, but not _______.
| A．something | B．anything |
| C．everything | D．nothing |
To build a people-centered socialism with Chinese characteristics is a long journey. It needs patience and ____________ from the people from all walks of life
| A．combination | B．instruction |
| C．strength | D．participation |
— What on earth are the police busy with?
— They have been looking into how the plane crash _______.
| A．came out | B．came up |
| C．came down | D．came about |
It is _________ to increase input in areas of innovation to ensure the country's promising prospect.
| A．accessible | B．essential |
| C．alternative | D．commercial |