David Beckham has ___it take to become a professional football player.
Finally he reached a lonely island ________ was completely cut off from the outside world.
There is no simple answer,________ is often the case in science.
John invited about 40 people to his wedding,most of________are family members.
We have launched another manmade satellite, ________is announced in today’s newspaper.
Many countries are now setting up national parks________animals and plants can be protected.