1 . The engineer and his son held ________ (frequency) meetings concerning technical problems. (所给词的适当形式填空)

2 . Our factory has ______(frequently) contacts with the neighbouring villages. (所给词的适当形式填空)

3 . (1)She gives ________ (frequently) performances of her work, both at home and abroad. (用所给词的适当形式填空)
(2)Buses run ________ (frequent) between the city and the airport.

4 . People are familiar with these stories in the Long March due to their ________(frequency) appearance in school textbooks. (所给词的适当形式填空)

5 . He is a___________(frequency) visitor to this country. (所给词的适当形式填空)

6 . He was so devoted to his work that he _________(frequent) stayed up late at night. (所给词的适当形式填空)

7 . The little girl takes part in various activities ___(frequent) to broaden her horizon. (所给词的适当形式填空)

8 . It’s not polite to interrupt a speaker with ________ (frequency) questions. （所给词的适当形式填空）

9 . She gives _______(frequently) performances of her work, both at home and abroad. (所给词的适当形式填空)

10 . Our factory has ________(frequently) contacts with the neighbouring villages. (所给词的适当形式填空)