B1.6 GE certainty and possibility

The drawing has eight legs. Spiders also have eight legs, so it ____ be a spider.

• must

• might

• can't

• could

"What are the straight lines?"

"I'm not sure. They ____ be paths."

• might

• must

• can't

• could

It's summer in Europe now, so it must ... winter in Peru.

• be

• been

• have been

• being

I'd like to walk along the lines, but they might ... people do that.

• let

• not let

• not

• lets

People ... the Nazca lines for fun.

• might have

• might have made

• might made

• might

Answer explanation

This is in the PAST, so the formula is:

modal verb + have + verb in past participle

The lines .... something very special for the ancient Nazca people.

• must have meant

• must mean

• must have mean

• meant

The Nazca people... simple tools to make the drawings. (could / use)

We know that water...easy to find in the area at the time.