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1£®Our experiment had got into ________ trouble£¬so we decided to take ________ chance to add more water£¬and luckily we made it.
A£®/; / B£®a; a C£®the; a D£®/; a
2£®Passengers are permitted________ only one piece of hand luggage onto the plane.
A£®to carry B£®carrying
C£®to be carried D£®being carried
3£®Brown said he was by no means annoyed; ________£¬ he was glad to be able to make himself clearly understood.
A£®all in all B£®for one thing
C£®on the contrary D£®by the way
4£®—Jack can't concentrate on his lessons recently.
—Yes, that might ________ his low scores in the last test.
A£®stand for B£®apply for
C£®account for D£®call for
5£®Please call my secretary to arrange a meeting this afternoon, or ________ it is convenient to you.
A£®whenever B£®however
C£®whichever D£®wherever