He made up his mind to devote his life _____ pollution ______happily．
A．to prevent; to live B．to prevent; from living
C．to preventing; to live D．to preventing; from living
—What did your parents think about your decision?
—They always let me do _____ I think I should.
A．when B．that C．how D．what
Tricks are often ______those who don’t look clever or smart
A．laughed at B．greeted C．played on D．made to
The little boy _____on the mat ____ to his parents that blackbirds had _____their eggs on Mars．
A．lay; lying; lied B．lied; lied; lied
C．laid; laid; laid D．lying; lied; laid
We were anxious about you．You home without us.
A．shouldn’t leave; tell B．mustn’t leave; tell
C．shouldn’t have left; telling D．can’t have left; telling
However, there was nobody that I could ____ help.
A．turn B．turn to C．turn for D．turn to for
