48. When I don't know what an English word means, I often look it ______________ in my English-Vietnamese dictionary.

A. on                                       B. in                                        C. at                                       d.up 

My friend from India speaks a _______________ of English that I sometimes find it hard to understand.

A. language                             B. dialect                                 C. jargon                                 D. bilingual

I often have fried beef, chicken, noodles for dinner so now I am overweight. My mother tells me __________ less meat and more vegetable but I don't like vegetable at all.

A. to eat                                              B .eat                           C. eating                                  D. ate

giải hệ pt

(x+1)(y-1)=xy-1

(x-3)(y-3)=xy-3

giải hệ pt

1/2x-2 + 4/y+5=3

3/2x-1 -2/y+5=-5