26. John cannot afford to go to university， ________ going abroad.

　　A) nothing but B) anything but C) not to speak of D) nothing to speak of

　　27. Most laboratory and field studies of human behavior ________ taking a situational photograph at a given time and in a given place.

　　A) involve B) compose C) enclose D) attach

　　28. If you don‘t like to swim， you ________ as well stay at home.

　　A) should B) may C) can D) would

　　29. Dr. Smith was always ________ the poor and the sick， often providing them with free medical care.

　　A) reminded of B) absorbed in C) tended by D) concerned about

　　30. Thomas Jefferson and John Adams died on July 4， 1826， the fiftieth ________ of American Independence.

　　A) ceremony B) occasion C) occurrence D) anniversary

　　CABDD