The boy has been missing for five days and his parents are worried about his ______.( )
A.attentionB.safetyC.actionD.growth
——Excuse me. Is it my turn now?——Not yet. Please wait on the chair ______your name is called.
I was surfing the Internet my brother was doing his homework.
She has studied in this school she was seven years old.
While Helen _____ along the river after supper, she ____ a wallet lying on the roadside. A. was walking; was finding B. walked; found B. walked; was finding D. was walking; found
____________ he exercises every day, _____________ he is very healthy. A. Because; / B. Because; so C. Though; /