Help mình với 3. When _____? - In 1928. A. penicillin was discovered B. was penicillin discovered C. penicillin has discovered D. has penicillin discovered 4. Most of the work _____ before the start of the 20th century. A. is completed B. was completed C. has been completed D. had been completed 5. The bus drivers went on strike _____ we had to walk to school. A. so that B. because C. so as to D. so 6. In our village, many people do not have _____ much money. A. too B. more C. the D. --- 7. Whenever we meet Bob, he always _____ to avoid _____ at us. A. try / to look B. tries / looking C. tries / look D. tried / looked 8. Peter told me _____ worried and promised _____ me whenever I _____ in difficulty. A. not being / help / am B. not to be / to help / was C. not be / to help / were D. not to be / to help / would be 9. I don't think _____ possible to guess a person's character by appearance. A. they B. them C. its D. it 10. She usually bothers us _____ her boast. A. with B. of C. from D. for