ying in a different country, justwatch others to see _____ they act to decide what the best to say is

lish Literature a____ lesson, or doeseveryone have to learn it

Nowadays when tourists pay a visit toXi’an, _______ for them to take public transport.

The scientist’s last words _________us thatwe should protect the environment around us.

Students should by all means______ their studies though there are a lot of entertainments inviting them.