My hometown ___ great changes in the past 10 years.
| A．happened | B．has happened | C．experienced | D．has experienced |
Though he is ill，he has not quit.
| A．smoke | B．to smoke | C．smoked | D．smoking |
Evidence of a powerful volcano, which erupted under the ice sheet of West Antarctica around 325BC and might still be active now, __________ so far by British scientists.
| A．confirmed | B．has confirmed |
| C．is confirmed | D．has been confirmed |
The reason why the girl decided to leave her boyfriend was that she didn’t feel _________.
| A．accurate | B．secure | C．unbearable | D．adequate |
Youras a student will be excellent if you develop a habit of reflecting on how you learn.
| A．operation | B．growth |
| C．performance | D．character |
It rained heavily in the south, ______ serious flooding in several provinces.
| A．caused | B．having caused |
| C．causing | D．to cause |