A group of young Americans have come to Beijing for a visit. Half of them, ___is, 50 persons, can speak Chinese fluently.
-It is a long time ________I saw you last. -Yes,and it will be a time ________we see each other again.
How long do you think it will be ________the computer company puts forward a new product?
How long do you suppose it is ________he arrived there?
Traveling ______a speed of 160 km/h,we have covered a distance of 120 kilometers ________less than 50 minutes.
The poor little boy ________by his heartless parents was seen begging in the street.