It is time every student ______ harder for the coming exam.

A. works

B. should work

C. work

D. worked

R1=R2=R3=36om
Có bao nhiêu cách mắc chúng vào mạch điện
Tính điện trở tương đương vs từng cách mắc

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 19 to 25.

  Foot racing is a popular activity in the US. It is seen not only as a competitive sport but also as a way to exercise, to enjoy the camaraderie of like-minded people, and to donate money to a good cause. Though serious runners may spend months training to compete, other runners and walkers might not train at all. Those not competing to win might run in an effort to beat their own time or simply to enjoy the fun and exercise. People of all ages, from those of less than one year (who may be pushed in astrollers) to those in their eighties, enter into this sport. The races are held on city streets, on college campuses, through parks, and in suburban areas, and they are commonly 5 to 10 kilometers in length.

  The largest footrace in the world is the 12-kilometer Bay to Breakers race that is held in San Francisco every spring. This race begins on the east side of the city near San Francisco Bay and ends on the west side at the Pacific Ocean. There may be 80.000 or more people running in this race through the streets and hills of San Francisco. In the front are the serious runners who compete to win and who might finish in as little as 35 minutes. Behind them are the thousands who take several hours to finish. In the back of the race are those who dress in costumes and come just for fun. One year there was a group of men who dressed like Elvis Presley, and another group consisted of firefighters who were tied together in a long line and who were carrying a fire hose. There was even a bridal party, in which the bride was dressed in a long white gown and the groom wore a tuxedo. The bride and groom threw flowers to bystanders, and they were actually married at some point along the route.

In what lines does the author give reasons for why people enter footraces?

A. Line 1-2

B. Line 4-5

C. Line 8-11

D. Line 13-14

Cho anđehit cộng H₂ theo phản ứng sau: C_nH_2n+1-2aCHO + xH₂ → C_nH_2n+1CH₂OH. Hệ số x của H₂ bằng

A. a + 1     

B. 2a 

C. a/2          

D. a

R1 = 48 ôm chịu được I max 0.2 A R2 = 36 ôm chịu được I max 0.5 ôm . Mắc R1 song song với R2 vào AB . Hỏi U max AB

Làm hộ mk với ...

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in  the following questions.

 The agreement ended six-month negotiation. It was signed yesterday.

A. The negotiation which lasted six months was signed yesterday.

B. The agreement which was signed yesterday lasted six months.

C. The agreement which was signed yesterday ended six-month negotiation.

D. The agreement which ends six-month negotiation was signed yesterday

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 23 to 27.

     Welcome to the Netherlands, a tiny country that only extends, at its broadest, 312 km north to south, and 264 km east to west - (23) _________ the land area increases slightly each year as a result of continuous land reclamation and drainage. With a lot of heart and much to offer, ‘Holland,’ as it is (24) _________ known to most of us abroad - a name stemming from its once most prominent provinces - has more going on per kilometer than most countries, and more English-speaking natives. You’ll be impressed by its (25) _________ cities and charmed by its countryside and villages, full of contrasts. From the exciting variety on offer, you could choose a romantic canal boat tour in Amsterdam, a Royal Tour by coach in The Hague, or a hydrofoil tour around the biggest harbour in the world - Rotterdam. In season you could visit the dazzling bulb fields, enjoy a full day on a boat, or take a bike tour through the pancake-flat countryside spiced with windmills. The possibilities are countless and the nationwide tourist office is on hand to give you information and help you (26) _________reservations. You’ll have (27) _________language problems here, as the Dutch are true linguists and English is spoken here almost universally.

Điền vào ô số 23

A. so

B. despite    

C. in spite of

D. although