Every student and every teacher ______.
____________better ways for digging tunnels__________, the first railway tunnel under the River Thames was dug in 1884.
The initial tunnels were just ___________ the surface of the ground. People were transported in carriages, which were ___________ the narrow tunnels by steam engines.
-Why ________ it rain at weekends? -Never mind, let’s watch TV at home.
___________ so delicious, the soup is very popular with the kids.
__________ these tips, and your time _______ doing research on the Internet _________ much worthwhile.