—It’ s getting dark. Has Mr. Johnson finished his house?—I have no idea,but this morning he was painting it.
John Logie Baird constructed the first color TV in 1928, but it was not until 1938 ______ the first color TV programme was broadcast.
Since his retirement from teaching music in 2001, Mr. Smith ______ a good deal of time painting as an artist.
Lawrence Craven, a doctor from the US, introduced the idea in 1953 _______ aspirin has the potential to reduce the risk of heart attacks.
Keeping on doing good deeds brings us peace of mind, ________ is important for our happiness.
_______ I have never thought of getting a job in such a big company, I’ll have a go at it.