___ is known to us all is ____ the sun is bigger than the earth.A It; that B What ; that C What ; how D That; that
________ 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.