By the time he was ten,Edison______experiments in chemistry.
They had their shabby houseand sold it for a big profit.
Next week we’ll pay a visit to the Great Wall, so in our absence pleaseour pet dog.
In view of all sorts of rumors and guesses, experts carried out some careful and scientific research and the possibility of a second earthquake in this area.
It’s unwise of you not tohis suggestions, for he is an authority in this field.
Rachel’s explanation was so confusing that no one could make any of it.