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.
The three college students did what they could _____ the two children, although they was in danger.
-Have you got your test result? -Not yet. The papers _____.
_______ a mobile phone can you ring _______ you want to talk with anywhere .
_______ we call the First Aid Centre, the doctors _______ by and by.
-You couldn’t have chosen any gift better for me. -______.