It is widely believed that an apple which fell from its branches were the _______ for Newton’s discovery of gravity.
In the 1930s, the two countries were at ______ war, and his father was fighting at _____ front.
Don't leave for there until__________ to do so.
Tom’s teacher kept on telling him to practise speaking English, but _______ didn’t work.
These plants are watered___________
Tom admitted ______ in the examination and he was not admitted _____ the school at last.