用所给单词的正确形式填空。

1. He was fast enough         (catch) up with the runner.

2. There is even         (little) milk in this bottle.

3. It took me two hours        (wash) all of my dirty clothes.

4. We must stop them from         (throw) litter into the river.

5. There are now         (live) things on other planets.

关于腭癌的叙述，以下哪一项不正确：（）

A.发生于硬腭的鳞癌其细胞多高度分化

B.软腭鳞癌较硬腭鳞癌恶性程度高

C.唾液腺来源的硬腭癌多见

D.软腭鳞癌出现淋巴结转移时主要是向颈深下淋巴结转移

E.软腭鳞癌较硬腭鳞癌的淋巴结转移早并较多