Our World 4: Unit 7: Review

1. Exercise 1 (Page 92) Read. Underline the correct word.

In 1906, Frank Fleer tried to make bubble gum, but it didn't taste good and stuck to everything! No one bought his ​ (a)   called "Blibber-Blubber" and Fleer ​ (b)   . Twenty years later, Fleer's employee Walter Diemer had a better idea. He put latex from trees in his bubble gum. Diemer ​ (c)   ! He ​ (d)   "Double Bubble."

• invention
• failed
• invented
• succeeded

1. Exercise 1 (Page 92) Read. Underline the correct word.

However, there was a ​ (a)   : kids didn't know how to ​ (b)   bubble gum! The Fleer Company quickly found a ​ (c)   : they went to cities and showed people how to blow bubbles! You can do anything with some ​ (d)   and ​ (e)   .

• problem
• solution
• use
• imagination
• creativity

Exercise 2 (Page 92) Read and Match.

• Frank Fleer tried to make bubble gum.

• Fleer’s gum failed because it used latex.

• Walter Diemer invented "Double Bubble."

• Diemer’s gum succeeded because no one bought it.

• The Fleer Company showed people how to blow bubbles.

• because no one bought it

• • Fleer’s gum failed

• • it used latex.

• • Frank Fleer tried to

• • "Double Bubble."

• • Diemer’s gum succeeded

• • make bubble gum.

• • Walter Diemer invented

• • how to blow bubbles.

• • The Fleer Company showed people

Exercise 6 (page 93): Look, read, and write. Complete the paragraph with used to or didn't use to. The Hobby Horse 1. People ​ (a)   ride this bicycle; they used to walk with it and move the handlebars! Most people ​ (b)   walk with it in gardens and parks. 2. Women ​ (c)   use bikes in those days. Only men used the Hobby Horse. 3. It ​ (d)   be difficult to lift or move. It was heavy because it was made of wood.

• didn't use to
• used to

Exercise 6 (page 93): Look, read, and write. Complete the paragraph with used to or didn't use to. The High Wheel Bicycle 1. People (a)   ride this bicycle, but it wasn't easy! The seat was very high, and the front wheel was very big. 2. People often (b)   fall off because the back wheel (c)   turn very easily. 3. The pedals were on the front wheel, so it (d)   be difficult to move them.

• used to
• didn't use to

7 (Page 93). Write. Make questions with did use to or used to.

1. Why / people / fall off / the High Wheel Bicycle? (11 words)

7 (Page 93). Write. Make questions with did use to or used to.

2. Where / people / use / the Hobby Horse? (9 words)

7 (Page 93). Write. Make questions with did use to or used to.

3. Which parts of / the Hobby Horse / move or turn? (11 words)