1.   Critics have expressed doubts about the draughtsmanship of both artists.

2.   Doubts were expressed in many quarters.

3.   Environmentalists began to express doubts about the benefits of biofuels.

4.   However, some analysts have expressed doubts about management continuity.

5.   However, some critics have expressed doubts over whether future governments can be locked into the promises.

6.   Many people expressed doubts about the necessity of the war.

7.   People like Ybreska were too afraid to have a commitment, even to openly express doubts.

8.   Rumours that no scientist expressed doubts about the potential problems are falsehoods perpetrated by officials with a vested interest.