44. If we recycle old things, we'll save natural resources
45. If you try your best, you'll pass your final exam
46. If he does morning exercises, he'll be stronger
47. They're planning to hold a big party this Sunday
48. How much does your backpack cost?
49. What is the price of those jeans?
Chúc bạn học tốt! Mong bạn rate 5 sao, cho mình "cảm ơn" và ctlhn nhé! (làm ơn cho mình ctlhn đi mà, mình cần cho nhóm T^T )