___ most of the earth’s surface is covered by water, fresh water is very rare and precious.
一Why is John so poor at his lessons?一He never studies ,he plays computer games all day
---- One more question, Sir? ----Wait a minute. I ____ your questions for more than 30 minutes without a break. Where is my cup?
Peter has been busy these days and seldom ____ to come over to have a chat with me.
. ---Have you paid your phone bill? --- No, the bill is _____ at the end of the month.
.My reaction towards my classmates at the party was so cold and emotionless ____ I had never been interested in them.