If you are an Introvert, you ......to prefer working alone and, if possible, will ....... towards projects where you can work by yourself or with as few people as possible.
Person who is more interested in his own thoughts and feelings than in things outside himself, and is often shy and unwilling to speak or join in activities with others is an introvert. Gravitate (Verb) means move towards or be attracted to somebody/something gradually and irresistibly; turn to somebody/something For example, (i) When this beautiful girl arrived, all the men in the room gravitated towards her. (ii) The conversation gravitated to sport. So, gravitate means attract. Hence, tend and gravitate can be used in the first and the second gap respectively to make the sentence meaningfully complete.