What good news! Such a successful gene ______ in pigs that it enables the pigs to produce human serum albumin, a protein made by the liver. Look! Here ________.
| A．have they modified…they come. |
| B．did they modify…come they |
| C．they have modified…are coming they |
| D．they modify…they are coming |
There are usually at least two _____ of looking.
| A．means | B．ways | C．directions | D．courses |
My sister cleans the house from _____ to bottom when she is expecting visitors.
| A．roof | B．ground | C．floor | D．top |
Facing danger, he always _____ calm.
| A．seems | B．remains | C．becomes | D．appears |
When my sister phoned me, I could not hear clearly what she was _____.
| A．speaking | B．talking | C．saying | D．telling |
She _____ me why she wanted to leave today.
| A．explained | B．said | C．told | D．suggested |