It is pleasure for us to make a graduate address in presence of thousands of students in the graduation ceremony.
| A．不填; a | B．the; 不填 | C．a; the | D．the; the |
---The air quality is getting worse and worse.
---____！We’ve never had so severe pollution before.
| A．I wouldn’t bet on it | B．You said it |
| C．You really have me there | D．Come off it |
Security authorities in China have worked together to launch a campaign to _____ sales of equipment designed for cheating.
| A．take out | B．leave out |
| C．wipe out | D．put out |
If certain species _____ extinct, an expert in New York, says there would be enough resources to reintroduced them in the future.
| A．had become | B．would become |
| C．are becoming | D．should become |
It has been five days since the three boys disappeared in the flood, so the chances are slight _____ they will be found alive.
| A．how | B．that | C．whether | D．when |
When I was young, I always went to the cinema on weekends and _____ sit there happily for hours.
| A．should | B．could | C．would | D．must |