Ⅰ.单项填空
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.
