Some teenagers _______ their health because they often expose themselves to so many electric products.
It was the third time that I ________ of the changes of the timetable.
He is driving a truck _______ of bananas when he came off the road at the bend and fell three hundred metres down the mountain.
__________ the heavy fog, our flight was held up eventually.
Nobody knows for sure how dinosaurs died out 65,000,000 years ago. It _______ because of sudden changes of their living conditions.
The British Museum, I think, is ________________ during the summer break.