Answers to modal verbs of this sight

[henz988]

Answers to modal verbs of this site

Hello forum,
The following questions come from this site:

http://www.englishpage.com/modals/interactivemodal1.htm (http://www.englishpage.com/modals/interactivemodal1.htm)

Modal Verbs Exercise 1

Gap-fill Exercise

can could have to must might should

9. The book is optional. My professor said we____ read it if we needed extra credit. But we ____read it if we don't want to.
15. I couldn't believe she said that to Megan! She _____ insult her cooking in front of everyone at the party last night. She _____ have just said she was full or had some salad if she didn't like the meal.
19. Must you always say the first thing that pops into your head? _____ you think once in awhile before you speak?

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Could you please help me with these gaps?

Many thanks in advance.

[Lucretia]

Hello henz988,

I'll try.
can could have to must might should
9. The book is optional. My professor said we could read it if we needed extra credit. But we don't have to read it if we don't want to.
15. I couldn't believe she said that to Megan! She shouldn't have insulted her cooking in front of everyone at the party last night. She might have just said she was full or had some salad if she didn't like the meal.
19. Must you always say the first thing that pops into your head? Shouldn't/ can't/couldn't you think once in awhile before you speak?

Best.