While he was ______ about in the street, Mary came up to him.
The more you practise _____ English, the better your _____ English will be.
The flowers ________ sweet in the garden look ________ and attract the visitors to the beauty of nature.
The possibility of a murder _____, the police have set about looking for the clues to her suicide.
—Mike, our team will play against the Rockets this weekend. I am sure we will win. —______!
Little Tom tiptoed quietly to the bird, but ______ into the forest when he was about to catch it.