Scientists photographed for the first time ever _____ wild gorillas used a stick to test the depth of a pool before getting into it, according to a recent study.
---When did you last hear _____ Jay? ---He phoned me this morning, and we agreed____ a time and place to meet. A of, to B about, with C. from, with D. from, on
It is __________ to spend money on preventing illnesses by promoting healthy living rather than spending on trying to make people ___________ after they are ill.()