选词填空time for reach for at the moment team invite appetite come across put up pastime beware 1.The 2008 Beijing Olympic Games were such a good _____________ the world to know more about China. 2.Sorry, I can't give you an answer _____________ .I need to think about it further. 3.The professor encourages us to ____________ opportunities instead of waiting for good luck. 4.The organizer has ____________ a number of famous singers to perform. at the opening ceremony (开幕式). 5.The great progress they have made comes from their good ____________ work. 6.Exercise will always give you a good ____________. 7.The computer can easily get stuck, so you must ____________ of computer viruses. 8.Before it got dark the campers ____________ their tent in a field. 9.When I ____________ a new word, I write it down in my notebook. 10.Chatting with friends over the Internet in the dead of night is probably my only ___________.