In the questionnaire, the subjects are questioned whether they ________ no smoking in the public area.

The ______ of some wild animals reminds us ______ the problems on the environment.

Don’t forget _________ your bed after you get up.

____ from space, our earth, with water covering 70% of its surface, appears as a “blue planet”[ ]

My father plans ______ me t o visit the Summer Palace this summer holiday.