--Shall we go for a picnic on Saturday or Sunday?    -- ______ is OK. I am free this weekend.

My father is teacher. He loves________ students very much.

找出字母中大小写不一致的选项

Sometimes parents find ______ hard to communicate with their children.

—____ the workers are very tired, _____they keep on working. — They are great. We must learn from them.