Quá khứ hoàn thành đơn giản

Điền vào các chỗ trống với các động từ trong ngoặc ở thì quá khứ hoàn thành đơn giản ở dạng khẳng định hoặc phủ định.

According to Dr Ken Winkle, Australia's Red-back spider is colonising the world. Dr Winkle, a venom expert from the University of Melbourne, said that authorities had found  Red-back spiders in Japan and Belgium. They suspected that spiders or their eggs  (enter) these countries along with Australian trading goods. Furthermore, it was extremely likely that the spiders  (make) their way into other nations around the world but that people  (discover) them yet. Dr Winkle said the spiders  (also / turn up) in the port city of Osaka in the late 1990s and  (multiply) quickly. He said Australian spider experts were collaborating with Japanese officials to find a way to stop the venomous invader.