./ It’s easy ………. the exercise 2 . a.understands b. to understand c. understanding d.understood . 2./ Would you mind if I………down? . a.sit b. sitting c. sat d. to sit . 3./ People use first-aid………… ease the victim’s pain and anxiety . a. so to as b. in order to c.so as to d. b and c are ok. 4./ The Le family was sleeping ………….. the mailman came. a. when b.while c. for d.to. 5./ .Mount Rushmore……………….. from more than 100 kilometers away. a. see b. saw c. can be seen d.seeing. 6./ It is a contest in which participants have to cook rice. It’s a …………….. contest. a. cook - rice b. water-fetching c. rice-cook d. rice- cooking. 7./ Nhi decided………………..for a walk . a. go b. to go c. going d.goes. 8./ Every milk bottle can be ……………….thirty times . a. reused b.to reuse c. reduced d. reducing .