Susan was expecting her favourite singers, but to her disappointment, _______ appeared.
_____has happened many times, children may get drowned in this river.
There is a mountain_____the top is always covered with snow.
The reason_____the manager explained at the meeting sounds reasonable.
I like to go shopping at the weekdays,_____the shop isn’t crowded.
The Science Museum,_____we visited during a recent trip to Britain, is one of London’s touristattractions.