_________ the experiement yet?

• Have they finished

• Have they been finishing

___________ a tropical storm?

• have you every seen

• Have you been seeing...

We____ to find a solution to the problem for weeks.

• have tr

• have been trying

Good news! Sam______ a solution to the problem!

• has found

• has been finding

Sorry I'm late. How long_______?

• have you waited

• have you been waiting

It_________ for ages.

• hasn't snowed

• hasn't been snowing

It______________ since I got up.

• has rained

• has been raining