Ⅰ.单句语法填空
1．Although we had told them not to keep us ________(wait)，they made no attempt to speed up deliveries.
2．There were so many people talking in the concert hall that I couldn't concentrate ________ the music.
3．It is said that the fingerprints found on the floor will be used ________(accuse)the murderer.
4．In hot weather，we often meet with ________(electricity)problem.
