Question

（2007，沈陽，5）You must always be careful ________ electricity. It's dangerous.

1. A.
   to
2. B.
   at
3. C.
   for
4. D.
   with

Answer 1

D
考查固定短語。句意為：你一定要小心電源，它很危險。be careful后邊加介詞with，表示“小心…”。