Millie在动词的时态上需要帮助。请你帮她从下面的方框里挑选合适的动词填空。

1．They ________ a lot of advanced electric equipments．

2．The exam is not as difficult as we ________ before．

3．No matter what the weather ________, you can always find surfers．

4．The China Dinosaurs Park always ________ a lot of visitors．

5．Though she was busy, she still kept on ________ English by herself．