Ⅰ.单句语法填空
1．As he walked into the classroom with that funnylooking hat，everyone burst out ________ (laugh)．
2．He is a foreigner and he is not accustomed to ________ (treat) like that.
3．________ spite of many invitations，he would always decline to visit Oxford.
4．My hometown isn't what it used to be. The last decade ________ (witness) great changes in the city images.
5．Much time ________ (spend) sitting at a desk, office workers are generally troubled by health problems.
