Chọn phương án đúng để hoàn thành mỗi câu sau đâyQuestion 3. When___in international trade, letters of credit are very convenient.A.are usedB.usingC.usedD.they usedQuestion 4. The 26th Annual Meeting of the Asia-Pacific Parliamentary Forum (APPF)___in Hanoi, our beautiful and peaceful capital city, from January 18th to 21st, 2O18.A.is heldB.is being heldC.was heldD.will be heldQuestion 5. We were made___hard when we were at school.A.to studyB.studyC.studyingD. studiedQuestion 6. Her fiance is said___from Harvard University five years ago.A.to have graduatedB.being graduatedC.having graduatedD. to be graduatedQuestion 7. Only one of our gifted students___to participate in the final competition.A.has been chosenB.was choosingC.have been chosenD.chosenQuestion 8. They cancelled all flights because of fog.A.All flights were because of fog cancelled.B.All flights were cancelled by them of fog.C.All flights were because of fog were cancelled.D. All flights were cancelled because of fog.Question 9. This building___finished by the end of last year but there have been so many strikes that it isn't finished yet.A. may not have beenB.will have beenC. should have beenD.was to have beenQuestion 10. As a small boy, he was used to___alone in the house for an hour or two.A.leavingB. being leftC.leaveD.be leftQuestion 11. DNA tests___accepted in court eases.A.were usedB.are knownC. will haveD.have beenQuestion 12. Ann hoped___to join the private club. She could make important business contact here.A.to inviteB.invitingC.to be invitedD.being invitedQuestion 13. Despite their normal cylindrical form, some of the documents___on silk that were found at Mawangdui, an archaeological site in southeastern China, were folded into rectangles.A. wroteB.writtenC.were writtenD.be writtenQuestion 14. The boy___by the teacher yesterday.A. punishingB.punishedC. punishD.was punishedQuestion 15. Robots will even___everywhere in factories, schools, offices, hospitals, shops, and homes.A.seeB.seenC. be seenD.sawQuestion 16. We don't allow anyone to use their cell phones during the examination.A.Nobody isn't allowed to use their cell phones during the examination.B.Nobody is allowed using their cell phones during the examination.C.Nobody is allowed to use their cell phones during the examination.D.Nobody isn't allowed using their cell phones during the examination.