Chất phóng xạ I 53 131  có chu kỳ bán rã 8 ngày đêm. Ban đầu có 1,00 g chất này thì sau 1 ngày đêm chất phóng xạ này còn lại

A. 0,69 g

B. 0,78 g

C. 0,92 g

D. 0,87 g

Ex1

1^st syllable stress:

visit,picnic,party,festival,yesterday,holiday,funfair,different, flower, weekend,grandparents.

2^ndsyllable stress:

enjoy,today

Ex2

go on a picnic,go to the zoo, Teacher's Day,the Sport festival,birthdayparty,join in the funfair

Ex3

go-went

have-had

enjoy-enjoied

hick- hicked

join- joined

watch- watched

visit- visited

stay- stayed

Ex4

1a

2b

3d

4b

5a

Ex5

1)i visited grandparents last weekend

2)in morning, we went on the picnic

3)did she watch cartoons on tv last night?

4)what did you do at the funfair?

tk mk nhe cac bn

Choose the letter A, B, C or D to complete the sentences

My brother sometimes listens to_________ in the afternoon.

A. songs

B. music

C. cartoons

D. pictures

2.3²

=2.9

=18

tk mk nhé

Choose the letter A, B, C or D the word that has different stress pattern from others.

A. market

B. eleven

C. paddy

D. vegetable