Smoking too much may ______ lung cancer and cause other diseases.
| A．devote to | B．attend to |
| C．contribute to | D．come to |
Reporters are _______ to get all facts straight and present their stories fairly.
| A．believed | B．supposed | C．thought | D．considered |
John ______ in his room when he heard screaming.
| A．is studying | B．studied | C．was studying | D．has studied |
Not only ______ in photography, but _____ an amateur courses to update my skills.
| A．I am interested; I took | B．interested I am; did I take |
| C．I am interested; did I take | D．am I interested; I took |
_____ is no doubt _____ John’s knowledge of first aid saved Ms Slade’s life.
| A．It; that | B．It; which | C．There; that | D．What; that |
In ____ accident _____ knowledge of first aid can make _____ real difference.
| A．the; a; the | B．an; a; a | C．an; the; 不填 | D．a; a; 不填 |