Bài 4: Cho dạng đúng của động từ trong ngoặc, gerund (V-ing) hoặc to-infinitive (to V)
9. Mrs. Leith offered________________us to the airport. (to take)
            10. Clare refused______________clean up after the party. (to help)
            11. I tried_______________him to come but it was no use. (to persuade)
            12. Do you mind not_______________? (to smoke)
            13. Everybody really enjoys ______________the cha-cha-cha. (to dance)
            14. Lionel admitted_____________my chocolate mousse. (to eat)
            15. We arranged_______________under the station clock at half nine. (to meet)
            16. The firemen managed_________________the fire pretty quickly. (to put out)
            17. I always try to avoid _______________him whenever I can. (to see)
 18. My brother denied______________my chocolate mousse. Maybe his hamster ate it. (to eat)