Colons

The following sentences may contain colon errors. Identify the answer choice that corrects these errors. (If there are no errors in the original sentence, select “correct sentence.”)

For help with this exercise, see section 28g of Focus on Reading and Writing.

  1. Question

    Casimir force causes: objects to stick together.

    A.
    B.
    C.
    D.

  2. Question

    When objects stick together in machines: Casimir force causes problems.

    A.
    B.
    C.
    D.

  3. Question

    Casimir force can be witnessed through a common occurrence: a gecko sticking to a wall by one toe.

    A.
    B.
    C.
    D.

  4. Question

    To produce the effect of levitation: scientists have reversed the Casimir force so that objects repel, rather than attract, one another.

    A.
    B.
    C.
    D.

  5. Question

    So far, the technology only works on one thing micro-objects.

    A.
    B.
    C.
    D.