1.   But there is grave doubt among environmentalists as to whether the Government will fulfil its promises according to schedule.

2.   I had grave doubts about where he might take it.

3.   I have grave doubts about his ability.

4.   I have grave doubts about that.

5.   Simply as a proposition this is open to grave doubt.

6.   I have grave doubts about this plan.

7.   I wonder and I have grave doubts and reservations, that Charles the Third will have a Portsmouth and a naval base to fortify.

8.   In my talk with Alec he himself expressed grave doubts whether he wished to take it on.

9.   It was around this time there were grave doubts about what might be called the cost-effectiveness of the results achieved by Bomber Command.