Nobody knows for sure how dinosaurs died out 65,000,000 years ago. It _______ because of sudden changes of their living conditions.
| A．must have happened | B．would have happened |
| C．should have happened | D．might have happened |
It sounds ＿＿＿＿＿ the singing of rails.
| A．as | B．in | C．like | D．as if |
Obviously, the old soldier’s knowledge of English＿＿＿very weak.
| A．seems | B．rised | C．remained | D．looked |
His girlfriend ＿＿＿＿＿a singer.
| A．has turned | B．grew | C．has become | D．turned |
It ＿＿＿＿＿ another fine day tomorrow.
| A．seems | B．appears | C．promises | D．looks |
She ＿＿＿＿＿ like her mother in character.
| A．feels | B．seems | C．looks | D．is |