The sentences given with blanks are to be filled with an appropriate word(s). Four alternatives are suggested for each question. For each question, choose the correct alternative and click the button corresponding to it.
The doctor has been ____ to attend to an urgent case
In the following question, out of the four alternatives, choose the word which is opposite in meaning to the given word and click the button correspondingto it.
Chemical weathering is caused by rain water reacting with the mineral grains in rocks to form new minerals (clays) and soluble salts. These reactions occur particularly when the water is slightly acidic.