There _________ a number of students in the hall and the number of them _________ over 1000.

The woman biologist stayed in Africa studying wild animals for 13 years before she returned. —Oh,dear! She ________ a lot of difficulties![ ]

The expert ____ health has discovered that five patients suffering the same disease are similar ____ age

Readingprovides the mind only with materials of knowledge; it is thinking that makes________ we read ours

Vivien worked very hard at all her lessons. __________, she became the top student in her class.