When you have a small child in the house, you _____ leave small objects lying around. Such objects _____ be swallowed, causing serious injury or even death.
shouldn't | mustn't; can
Hiking the trail to the peak _____ be dangerous if you are not well prepared for dramatic weather changes. You _____ research the route a little more before you attempt the ascent.
can; should
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.
can; don't have to
I know that I _____ study hard in order to get knowledge and a good job later.
am supposed to | should | have to
Please make sure to water my plants while I am gone. If they don't get enough water, they _____ die.
will | could | might
I think you _____ tell him the truth. You are his friend.
should | ought to | must
You _____ take your umbrella along with you today. The weatherman on the news said there's a storm north of here and it _____ rain later on this afternoon.
should; might | could
Ned: _____ I borrow your lighter for a minute? Stephen: Sure, no problem. Actually, you _____ keep it if you want to. I've given up smoking.
Can | Could; can
If you want to get a better feeling for how the city is laid out, you _____ walk downtown and explore the waterfront.
should | can
_____ we pull over at the next rest stop? I really _____ use the bathroom and I don't know if I hold it until we get to Chicago.
Can | Could; need to | have to
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