16. Eko: Agus: Agus, what do we... do if our teacher doesn't come? Agus : We have to study by ourselves the next materials about expression of necessity. A. had to B. have to C. suggest D. has to 17. Eny: I'm sorry I come late, Ka. Ika : You ... notice me before. Eny: This is not my intention, my tire was broken. Ika : O.K. It is reasonable.A. have toB. has toC. had toD. mustn't18. Edi .... : Alex : Yes, I have to go now. I have a promise with my father to go to hospital.Edi: take careA. I have to go now. B. What do we have to go now? C. You mustn't go now. D. Do you have to go now? 19. Fajar : I want to make a kite, but I don't have paper. What do you suggest? Eko : ... use plastic . I've ever seen a plastic kite. Fajar : O.K. I will use it. Thanks.A. Why don't you. B. I agree with you C. What do you think I should do D. Do you have any suggestion 20. Mr. Aji: Hey, ... It's too dangerous, there are many vehicles. Ari : I'm sorry, sir. A. Don't play football on the street. B. Play football on the street, please. C. I have to play football on the street. D. I suggest you to play football on the street.
Suatu zat radioaktif sebanyak 24,6 gram memiliki waktu paruh 4 tahun. Setelah 8 tahun sisa zat radioaktif tersebut adalah...
a). 4,15 gram
b). 5,15 gram
c). 6,15 gram
d). 7,15 gram
e). 8,15 gram