Write the correct word in the gaps. Use the words from ex. 1. 1. The companies are fighting an __________ of problems at the moment. 2. An __________ of stones fell off the mountain and blocked the road. 3. Roads were closed because of a heavy snowfall – it was a real severe __________. 4. There was a __________ of phone calls and emails – I couldn't cope with answering them. 5. There wasn't a drop of rain for a long time. It looked like we were going to have a __________.