Choose the most appropriate form to complete the following sentence.

I _____ the keys that I lost yet.

Choose the most appropriate form to complete the following sentence.

When I got home, I saw that I _____ the door.

Choose the most appropriate forms to complete the following sentence.

Hundreds of people ___________  in this factory and many of them ___________

 their jobs.

Choose the most appropriate forms to complete the following sentence.

I _____ with Jake last Tuesday and he says you _____ him for months.

Complete the sentence with the correct verb forms.

Wikipedia ____ an online ‘crowdsourced’ encyclopaedia that ______ constantly ________by thousands of volunteers from all over the world.

Choose the most appropriate forms to complete the following sentence.

As soon as we walked into the room, we _____ a noise. Someone ______ my computer.

Complete the sentence with the correct verb forms.

Some of the things __________in 1920s _________the lives of millions of people, and some of those inventions _________ still widely used today.

Choose the most appropriate forms to complete the following sentence.

Three men _________ after the incident, and five others _________ to hospital.

Complete the sentence with the correct verb forms.

Ecotourism is an environmentally responsible travel to natural areas in order ____________  and __________  nature that promote conservation.

Choose the most appropriate expression to complete the following sentence.

 _____ the door when you left?