While watching television,__________.
| A．the doorbell rang | B．the doorbell rings |
| C．we heard the doorbell ring | D．we heard the door bell rings |
When ____ about the possibility that Justin was taken away by aliens, Detective San Peterson, who has taken charge of the case, didn’t say much.
| A．asking | B．asked | C．to ask | D．ask |
There is no hard evidence ____ aliens took Justin that night.
| A．that | B．what | C．which | D．how |
My mother suggested that she _____ me to the hospital, where I received good medical treatment.
| A．sent | B．sended | C．send | D．to send |
Mr Ma is the person _____ we learned how to write with brushes.
| A．whom | B．from who |
| C．from whom | D．from which |
The _______ boy made the police and his family _______.
| A．gone; puzzled | B．missing; puzzled |
| C．missing; puzzling | D．lost; puzzling |