— The woman biologist stayed in Africa studying wild animals for 13 years before she returned. — Oh, dear ! She ______ a lot of difficulties !
Ever since the food safety accident, the company has carried out _______ checks on milk products to make sure that they are of high quality..
The businessman is always encouraging his employees to ______ water-based sports, hoping to develop an amateur racing team in his own company.
Until the noise of the bus _______ , we were able to hear the program again.
The building is carefully designed so that everyone can leave the building safely if an accident ________.
Your desk is crowded with too many unnecessary things, including used papers and books. You’s better ______ some of them.