fred sometimes helps his mother...... the housework(doing,do,did,to doing)
he is the.....intelligent student i've ever taught at school(best,goodest,more,most)
if you want to.....your speaking, you should speak english with friends(describe,pass,improve,express
practice listening to english tapes or english programs on the(song,dictionary,radio,book)
.......energy should be used to substitute for coal,gas and oil(sun,solar,wind,water)