. Progress so far has been very good. _______, we are sure that the project will be completed on time.
| A．However | B．Otherwise | C．Therefore | D．Besides |
The two brothers look much the same , but they have nothing ________.
| A．commonly | B．differently | C．in different | D．in common |
The farm _______once we worked has changed a lot.
| A．where | B．that | C．which | D．What |
I have no doubt ______ she will come out first in the English contest.
| A．if | B．about | C．whether | D．that |
Her teacher helped her so much that she bought him a beautiful pen _________.
| A．by turns | B．in return | C．in answer | D．in turn |
His disappearance(失踪)______ by the police.
| A．looked at | B．will be looked in | C．is being looked into | D．has been looked up |