1. The examiner asked the students to write their names ____ the top of paper.
2. In many countries people can buy things ______ installments.
4. When the boy got ______ the bus, he found that two policemen were walking towards him in the street.
8. She spent two evenings _______ playing chess.
10. He is sitting at the table covered _______ flowers.
13. _______ the help _______ the teachers, the students have made great progress _______their study.
16. ______reaching the city he called up his parents.
18. The backward area has achieved self-sufficient ______grain.
參考答案:on
by
off
in
with
With;of
After
with