Question

1. My parents ….. in the garden for 3 hours.

a) works b) are working c) has been working d) have been working
2/ You ….. take a bus to get to the museum. It’s far from here.

a) should b) may c) must d) has to

3. In the past people protected ….. by high walls.

a) they b) himself c) their d)themselves

Answer 1

have been working
should
themselves