.Elephants, which are the largest mammals on the earth, have almost no natural enemies ______ human beings.
If my father ______here now, he _____ tell me what to do. But he left home just one hour ago.
Guilin is a beautiful place ______ you can enjoy yourself a lot.
It’s always difficult being in a foreign country , ____ when you can’t speak the local language .
. Look at the picture. The painter, I think, is the most ______ artist in the country.
Mary ought to attend school this autumn, but she ______ up early in the morning.