His income is double _____ it was five years ago.
The place_____ the bridge is supposed to be built should be _____ the cross-river traffic is the heaviest.
Between 1918 and 1938, many new stations were constructed,__________ was designed by an architect named Charles Holden.
In our class there are 50 students,half ___________ wear glasses.
With a lot of homework _________last weekend, Tom didn’t go to the movies with his friends.
They use computers to keep the traffic _________ smoothly.