23. When Africans started _________ cacao trees, they stopped fighting, so chocolate brought peace there. A. grow B. grows C. grew D. growing 24. . If it rains tomorrow, we _________ postpone going on a picnic. A. could B. may C. would D. had to 25. The tradition of taking different meats, and sometimes vegetables as well, and spearing them with a sharp stick called a skewer ______ cultural lines today.(A. crossed B. has crossed C. crosses D. is crossing 26. The manager is away on a business _________ so I am in charge of the office now. A. trip B. tour C. voyage D. visit 27. If you want to see historical places, it is a good idea to go on a guided _________. A. voyage B. visit C. tour D. cruise 28. They spent two weeks at a fashionable ski ____ in Switzerland.(A. resort B. boarding C. region D. area cần gấp