— The woman biologist stayed in Africa studying wild animals for 13 years before she returned. — Oh, dear! She ______ a lot of difficulties!
----The cake smells delicious. ---- ____.
----It's too late now. I think it's time for me to leave. ---- ____.
Is this school ____ you studied at ten years ago?
What the boy ____ make his friends happy.
He was so pleased with all ______ we had done for him _____ he wrote us a letter to praise us for it.