----- Nội dung dịch tự động từ ảnh ----- 30. While in London, Lenin wrote. a. about b. in 31. You should take an aspirin. a. if b. but 32. - Who are you waiting. - My classmates. a. for b. at 33. If the headache still continues, send for a. doctor b. doctors 34. Karl Marx knew. Spanish, and Russian. a. only the newspaper Iskra. c. for d. to any other tablet to kill the pain. c. or d. as ..? c. in d. on at once. c. a doctor d. some doctors English and German, but also French, b. not only c. did only 35. He...................... for an hour when you arrived home. a. has waited b. had been waited c. has been waiting d. had been waiting d. both