### Ex 1: Match the actions to the purposes, then write complete sentences.

1. They listen to music with lyrics - a. understand the actors’ words
2. She goes over her writing - b. look for mistakes
3. I look new words up - c. know their meanings

**Complete Sentences:**

1. They listen to music with lyrics to understand the actors’ words.
2. She goes over her writing to look for mistakes.
3. I look new words up to know their meanings.

### Ex 2: Fill in the blanks with the given words.

1. I really don’t know **what to say** in my graduation speech. (E. what to say)
2. We’re **not sure** where to hang the painting. (D. not sure)
3. Nguyen asked his teacher **whether** the computer. (B. whether)
4. He wondered **when to start** to tell that to her. (A. when to start)
5. Lan can’t decide **who to invite** to her birthday party. (C. who to invite)

**Corrected Sentences:**

1. I really don’t know **what to say** in my graduation speech. (E. what to say)
2. We’re **not sure** where to hang the painting. (D. not sure)
3. Nguyen asked his teacher **how to use** the computer. (Note: "whether" doesn't fit here; "how to use" would be more appropriate.)
4. He wondered **whether** to tell that to her. (B. whether)
5. Lan can’t decide **who to invite** to her birthday party. (C. who to invite)