They will be very _____ to see you here.

_____ in Paris, the Louvre is one of the world’s largest art galleries. 

When ________ why she could speak English so well, she just smiled and said nothing.

After a long absence, I went back to college, ______ to pick up where I'd left off．

English teachers are supposed ________ their students a test in class, even after class, ________ better teaching results.