Hai vòi nước cùng chảy vào một bể không có nước thì sau 12 giờ đầy bể. Người ta mở cả hai vòi trong 4 giờ rồi khóa vòi 2 lại và để vòi 1 chảy tiếp trong 14 giờ nữa thì đẩy bể. Hỏi nếu mỗi vòi chảy một mình thì trong bao lâu đầy bể?

Cỏt Correct the mistakes

1. The Great Barrier Reef is the world's largest living structure in UNESCO's list of natural wonders

2. Christopher Columbus firstly saw Native Americans when he discovered the Caribbean Islands on October 12,1492

Correct the mistakes

It has been a long time since we last talked to each other, isn't it?

OPPOSITE

When all the instruments had been checked out, the pilot signaled that he was ready for take off

A. jet lag

B. stopover

C. delay

D. touchdown

37. Thousands of tourists and pilgrims get to that church every year

A. That church is visited by thousands of tourists and pilgrims every year

B. That church is rebuilt by thousands of tourists and pilgrims every year

C. That church is cleaned by thousands of tourists and pilgrims every year

D. That church is painted by thousands of tourists and pilgrims every year

35. The package tour costs 100 dollars. The guided tour costs 200 dollars

A. The package tour is as expensive as the guided tour

B. The guided tour is cheaper than the package tour

C. The package tour is not so expensive as the guided tour

D. The guided tour is not more expensive than the package tour 38. Why don't you we make a salad for a picnic tomorrow?

A. Let's making a salad for a picnic tomorrow

B. Shall we not make a salad for a picnic tomorrow?

C. What about making a salad for a picnic tomorrow?

D. How about make a salad for a picnic tomorrow?

39. It is two months since I last had dinner in this restaurant

A. I often have dinner in this restaurant

B. I have not had dinner in this restaurant for two months

C. I used to have dinner in this restaurant for two months

D. I am going to have dinner in this restaurant in the next two months

40. It's a pity that my flight to New York is delayed by the heavy snow A. I wish my flight to New York isn't delayed by the heavy snow

B. I wish my flight to New York delayed by the heavy snow

C. I wish my flight to New York has been delayed by the heavy snow

D. I wish my flight to New York wasn't delayed by the heavy snow

A typical korean meal consists of a bowl of rice, a bowl of soup or stew, and other dishes. koreans use a huge range of vegetables, and all types of meat in (23)______ traditional korean dishes and some typical dishes can be found in korean kitchens all over the world.

"Mandoo" is a (24)______ preparations. there are so many of good luck when it is prepared as a part of korean lunar new year's festival. it is made with beef or pork, but it also can be made with chicken or only vegetables.

"Chap Chae" is one of (25)______ sweet potatoes. it can be (26)_______ noodle dishes in korea. the noodles are made from beans or cool or hot, and as an appetizer or main dish.

“Sam Gae Jang" is a kind of chicken soup. it is easy to prepare. like chicken soup in the west, it is often used as a kind of treatment when we are sick.

"Kim Chi" is one of the most distinctive part of korean diet. it is made from napa cabbages and chili, and eaten at almost every (27)______.

Ingredients and dishes vary by province. many regional dishes have become popular across the country.

23. A.vary B.varied C.various D.variety

24. A.symbol B. gift C.preparation D. ingredient

25. A.more popular B.the most popular C. the more popular D. popularity

26. A.enjoy B. to enjoy C.enjoying D. enjoyed

27. A. dish B. places C.meal D. families

I am going to visit Japan next week and Tokyo is our ________ destination

A. final

B. finally

C. finalize

D. finalization

Sugar provides energy; ________, it cloud cause obesity and hurt your teeth

A. nevertheless

B. even though

C. because

D. if

Your mother has never tried sushi before, hasn't she?

A. Your

B. tried

C. before

D. hasn't

(P): y=x²

(d): y= 2(m+1)+4

Chứng minh d luôn cắt P tại 2 điểm phân biệt