用括号内所给动词的适当形式填空
小题1:Xiao Li promised to chat with me on the Internet, but so far he __________ (not do) so.
小题2:At the moment we have too much to do __________ (think) of doing anything else.
小题3:Last Friday afternoon the young man __________ (hurt) in the traffic accident which happened on the highway.
小题4:Sound __________ (travel) through air at a speed of about 340 meters per second.
小题5:Food cannot __________ (keep) properly in a fridge at an unsuitable temperature.
小题6:The snow __________ (stop) when she woke up and the sun was shining brightly.
小题7:Every one of us was excited, for in a few minutes we __________ (see) Liu Xiang appear on the sports ground.
小题8:The Women’s World Cup __________ (not begin) until 1991 when China hosted it in Guangzhou.
小题9:Understanding yourself is very important to __________ (build) self-confidence.
小题10:On Earth, gravity keeps our feet on the ground and makes anything we drop __________ (fall) towards the ground.
