The math problem is too difficult ,I can’t__________ .

Ifyouareconfidentenough,socialsituationsdon’tbotheryouintheslightest.

Mr. Black, I find ______ difficult to play the piano well.—Oh, I think you just need to practice more

This is a picture ______ my room. [ ]

Tom, you look tired this morning. What’s wrong? —I was so busy that I didn’t go to bed _______ 12 o’clock last night. [ ]