1 . A tsunami(海啸) occurs as a series of waves _______ (know) as a “wave train,” and the series of surges (巨浪) can be five minutes or up to an hour apart. (所给词的适当形式填空)

2 . Songjiang District, ________(locate) in the southwestern part of Shanghai, will develop rapidly by 2025. (所给词的适当形式填空)

3 . The Olympics are an extraordinary sporting event __________(hold) every four years, ____________ thousands of ___________(high) trained and talented athletes gather together in the spirit of friendship, solidarity and fair play in order to compete________ each other in different events. (所给词的适当形式填空)

4 . It is a truth universally _______ that a single man in possession of a great fortune must in want of a wife. And more universal _________ is that a married man in possession of great wealth must be in want of a heir. (acknowledge) (所给词的适当形式填空)

5 . A 2020 study ____________ (conduct) by Common Sense Media found that people spend up to 9 hours a day in front of screens. (所给词的适当形式填空)

6 . (2020年北京卷)A piece of stone__________(find) on a Dutch beach suggests that our extinct human relatives, known as Neanderthals, were cleverer than previously thought. (所给词的适当形式填空)