________, no one is sure who discovered America .
I spent the whole day repairing the motorbike. The work was ____ simple.
——Did your classmate accept your invitation? ——No, he ____ refused.
____ abroad for a tour can be a great honor for an ordinary person like me.
——We are informed that the Weifang International Kite Festival starts at 7:00. ——Oh, I didn’t expect it was so early! I ____ to go out for dinner with my friends first.
——Why was our foreign teacher unhappy yesterday? ——News about the tsunami striking her country ____ an attack of homesickness.