1Who did the teacher have _______ how _______ the computer?

A. to show, to use    B. showed, use    C. shown, using   D. show, to use

Who did the teacher have _______ how _______ the computer?

1. A.
   to show, to use
2. B.
   showed, use
3. C.
   shown, using
4. D.
   show, to use

Have you seen the things ________ in the museum?

A. on show

B. on showed

C. are shown

D. on showing