The plane ______ when we got to the airport.

Betty, your English is very good. have you learnt it?－For about 5 years. [ ]

Where is my pen?—I _________ it on the desk, but I don’t know who _________ it away.

I don’t know if she________to the party. If she________ she’ll call me.

There is something______they have learned from scientific study.[ ]