Mk đc hok??

4 cặp 

1) I...did......my Maths homework yesterday. (to do)
2)....Did.....Susan..go.......to England by plane? (to go)
3) They.....visited....a farm two weeks ago. (to visit)
4) Jenny and Peggy...didn't help......their brother. (not/to help)
5) The children....weren't.....at home last weekend. (not/to be)
6) When....did.....you...design......this wonderful skirt? (to design)
7) My mother....didn't crash.....into the van. (not/to crash)
8) The boys...took off......the mudguards of their bicycles. (to take off)
9).....Did ....you..phone.....your aunt last week?(to phone)

Bài này mk đc lm rồi hok bt phải v hok??

They are  talking the  vegetables to the city 's markets

Our class has two days ( to rehearse / rehearse / rehearsing / rehearsal ) the song

(A. Amount B. Little C. Most D. A little ) of the movies on TV are very old

a) x² - x = 0 <=> x(x - 1) = 0 <=> x = 0 hoặc x - 1 = 0 <=> x = 0 hoặc x = 1

Vậy : S = {0; 1}.

b) x² - 2x = 0 <=> x(x - 2) <=> x = 0 hoặc x - 2 = 0 <=> x = 0 hoặc x = 2

Vậy : S = {0; 2).

(Bài này dễ mà)

It ( has to / needs / is / should ) necessary to find out the answer to the question