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 |