... c dropping d to drop →c 20 If you a picnic, remember to take some fruits with you a go for b travel c make d run →a 21 They walked because they couldn't to take a taxi a pay b spend c worth ... 40 His son went out, but he didn’t tell where he was going a anyone b no one c one d none →a 41 Tam said that many roads were in Danang city a been built b being built c building d been building...