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

—Who has taken my pen away?—__________. He was here a moment ago.  

"They didn’t take measures in time, otherwise the explosions ____．"some experts said．

. Research findings show we spend about two hours dreaming every night, no matter what we ____ have done during the day. 

Without you, I _______ the first prize in the speech contest. Thank you, John.