Grammar: Complex sentences

Select the example of a complex sentence:

A. Shake it until it breaks.

B. Shake it, and then pour it.

Select the example of a complex sentence:

A. It's raining in the city.

B. Even though it is still raining, it will work.

C. It's still raining, but it will work.

Select the example of a complex sentence:

A. I used to love scones.

B. When I was a teenager, I ate at least four scones a day.

Select the example of a complex sentence:

A. Wash those dishes before you leave.

B. Wash those dishes, lazy bones.

Find the subordinating conjunction in the following complex sentence.

The human brain never stops working until you stand up to speak in public.

Select the example of a complex sentence:

A. Sarah can eat four boiled eggs in a minute.

B. Sarah can eat four boiled eggs if she puts her mind to it.

Find the subordinating conjunction in the following complex sentence.

Wise men speak because they have something to say.

Find the subordinating conjunction in the following complex sentence.

Both the cockroach and the bird would get along very well without us although the cockroach would miss us most.

True or false? If the dependent clause of a complex sentence is at the front, it is usual to offset it with a comma.

A. True

B. False

Thanks for attention