Read each sentence carefully. Put the verb in brackets into the Present Perfect or Present Perfect Continuous.
Do not use contractions. Write full forms.
1. The student astronomy club three new variable stars in images from an online telescope archive. (already / find)
2. All week, the expedition volunteers in their field journals as they usually do after each survey, because the notebooks got soaked during a river crossing. (not / write)
3. How long marine biologists blue whales with underwater microphones to study how their songs change across the Pacific? (track)
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