____ I'm mistaken, I've seen that tall man at a party before.
| A．If | B．As |
| C．Unless | D．When |
71. He didn’t ______ what I read because his mind was on something else.
| A．hold on | B．catch on | C．take in | D．get over |
72. For many days I have been trying to ______ what it is that makes Jack so angry.
| A．carry out | B．figure out | C．watch out | D．make out |
73. --- You just think of yourself! You kept me waiting for at least three hours.
--- I’m sorry that you _____ think so.
| A．will | B．would | C．should | D．Could |
74. --- Sally, would you ______ the story?
--- But I told the second part of the story this morning! It should be Jean’s turn.
| A．pick up | B．put up | C．bring up | D．make up |
75. When on holidays, the railways put on _____ trains to make people’s travel more convenient.
| A．regular | B．special | C．particular | D．Unusual |