chieved a lot in my study, thanks to ____who helped me

Somebody ______the blackboard．—Well, it wasn’t me．I didn’t doit．

If we become more_____ in predicting earthquakes,we’ll reduce loss. [ ]

In spite of repeated wrongs done to him, he looks _____ to people greeting him.

Was it in 1969 _______ the American astronauts succeeded ______ landing on the moon? [ ]