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 |
Beautifully ________ in a quiet spot near the river, the hotel attracts a lot of people to stay.
| A．locating | B．lies | C．situated | D．sat |
_________ we have been classmates for three years, she hasn’t left me much impression, so I can’t remember her after graduation.
| A．Since | B．Although | C．Because | D．Unless |
When and where to build the new factory _____not decided yet .
| A．is | B．are | C．has | D． have |
The fire was finally brought under control, but extensive damage _________.
| A．is caused | B．was causing | C．had caused | D．had been caused |
– I’m sorry for being late. I should have phoned you earlier.
– _____. I’ve just arrived.
| A．That’s no trouble. | B．You are welcome. | C．That’s all right. | D．You can never tell. |