单句语法填空
1．People are_warned(warn) to be careful of the traffic when they cross the road.
2．A medical team will_be_sent(send) to the floodstricken area tomorrow.
3．I have bought two ball pens，but neither of them writes(write) well.
4．A lecture about the choice of careers is_being_given(give) in our classroom now.
5．Two thousand words had_been_learned(learn) by the end of last term.
