－When did you today－At 8:00.

People should open the window in the morning to make air __________ in order to keep the indoor air fresh.[ ]

_____ more and more students graduating from college, it is harder for them to find suitable jobs.

Tom make up his mind to get a seat for the football match ________ it means standing in a queue all night

Indeed,thanks to the good ideas of lots of people,like the cycling fans in the 1960s,many people around the world______the city centre streets without cars for many years