Present Perfect Continuous

Choose the right answer. Jane ... the cycle of life all this semester.

Choose the right answer. He ... under the pouring rain for two hours.

Choose the right answer. Sally ... rubbish for a month already.

Choose the right answer. David ... his favorite series for an hour.

Choose the right answer. I ... in the garden for the whole day.

Choose the right answer. Rose and her friend ... out the pond for half an hour already.

Choose the right answer. You ... this test already for forty minutes.

Choose the right answer. This pollution ... in the clouds since morning.

Choose the right answer. Dave ... flowers all his life.

Choose the right answer. Tim ... nesting boxes the whole day today.