Modal verbs of speculation

I have no idea why she is leaving the meeting. She _____ need to go somewhere.

• can

• might

• must

• can't

Why didn't she come? I talked to her last night and she was fine, so she ____ be sick.

• might

• can't

• must

• could

Look at those dark cloud!

Oh no! it _____ be raining over there.

• can

• might

• must

• mustn't

The bees aren't moving! They _____ be dead.

• may

• might

• must

• can

They look very different. They ________ be related

• may

• might

• must

• must not

The article says that pigs are extinct. That _____ be true!

• must

• might

• can

• can't

The research is taking a long time! It ______ require a lot of work.

• may not

• must

• must not

• can

Tom is lost. He ______ know the address.

• must

• can

• could

• must not

Where ____ my wallet be?

• must

• must not

• could

• coulcn't

According to some studies, plants _____ be able to listen to other plants.

• can

• may

• must not

• may not