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

_________, you should read the passage and grasp the main idea. Then, if there are too many new words, try to _________ your dictionary.

Mr Richard was disappointed that manystudents who had signed up for his adventure course _______ at the last moment

Look，Tina is waiting ________ the bus stop．

The question is ______ it is worth doing