When I was walking in the street yesterday，I saw a UFO________over my head．
A．flying
B．flies
C．flew
D．to fly
Many books________about“the art of giving”；you can buy one for yourself．
A．write
B．have been written
C．are writing
D．will write
The clothes are aimed________teenagers．
A．to
B．in
C．about
D．at
Remember________your host’s suggestions and________the rules．
A．to follow；obey
B．following；obeying
C．to keep；to keep
D．obey；follow
Pandas are________animals in the world．We must do something to protect them．
A．endangered
B．danger
C．dangerous
D．in danger
The ads in the newspaper lead some people________on trips to London．
A．to go
B．go
C．going
D．went
