John’s ability to learn from observations and experience_______ greatly to his success in public life.
| A．owed | B．attached | C．related | D．contributed |
The news shocked the public, ________to great concern about students’ safety at school.
| A．having led | B．led | C．leading | D．to lead |
.Everything comes with________ price; there is no such________ thing as a free lunch in the world.
| A．a; a | B．the;/ | C．the; | D．a;/ |
Teachers recommend parents________ their children under 12 to ride bicycles to school for safety.
| A．not allow | B．do not allow | C．mustn’t allow | D．couldn’t allow |
For many years, people________ electric cars. However, making them has been more difficult than predicted.
| A．dream of | B．had dreamed of | C．dreamed of | D．have dreamed of |
In April, thousands of holidaymakers remained________ abroad due to the volcanic ash cloud.
| A．sticking | B．to be stuck | C．stuck | D．to have stuck |