. If you can’t release your unpleasant past, you may create a vicious cycle(恶性循环) negative influence and feelings are reinforced(加强 ).
________ inthought,healmostranintothecarinfrontofhim.
I watched the plane go higher and higher until I lost _____ of it.
I usually take something to read when I travel by train _____I feel bored.
Out _____, with an apple in his hand.
Not until he met with the difficulty _______ the importance of group work.