a small noticeable part of a problem, which is really much bigger - The plastic that can be cleaned from the shore is just the t_______ of the i______.

a fuel such as coal or oil that is obtained from under the ground - We need to find alternatives to f________ f________.

To allocate, designate or set for a specific purpose - The teacher says that she will a_________ seats for us so that the students do not fight for the best ones.

when the world becomes warmer because of pollution - G_______ w_______ is affecting the polar ice caps.

to tell someone that you are sorry - You should a_______ to the teacher for missing her class.

energy that comes from sources such as wind or the sun - The house is heated entirely from n_______ e_________.

mental problems that affect a person’s ability to learn things - Some of the children have specific L________ d________.

a state in which your body is protected from disease - The vaccination gives you i_________ against the disease for six months.

to accept something to be true without question or proof - My parent just a___________ that I will go on to study at university, but I am not so sure.

a period of time when the weather is much hotter than usual - The h______ w_________ is set to last for another week.

Use one´s experience, talents, or skills as a resource - Sue has a lot of past experience to d________ o______.

barriers or methods used to stop an area from flooding - The government plans to build stronger f______ d_______ on this area of coastline.

learning something from memory, rather than understanding it - Much of what they do in class is little more than r______ L_______.