短文填空: 从方框中选择单词并用适当的形式填空。5分

time      teach   go    interest    think

Now more and more students are taking different supplementary classes. Some students 小题1:________ it is more effective to learn with other teachers than by themselves. And they can learn more things. Some think it isn’t necessary to 小题2:_________ to the supplementary classes. Students need 小题3:___________ to rest after a long week of study. Also , many supplementary classes just want to make money.
In my opinion , you may go to the classes if you are weak at or 小题4:___________ in them. But be sure to choose a suitable class and a good 小题5:___________. Otherwise , it would be a waste of time and money.