这些题目主要涵盖的是初中英语的基础词汇和语法知识，适合八年级学生进行复习和巩固。以下是对每个题目涉及知识点的详细解释：
1. Linder offers her pocket money to the Hope Project. (选择题，C gives)
- 知识点：动词短语"offer sth. to sb."表示“提供某物给某人”，在这里与"give"同义。
2. I will continue playing the game after finishing the homework. (选择题，A go on)
- 知识点："continue doing sth." 表示“继续做某事”，相当于"go on doing sth."。
3. Her face is full of joy. Is there any good news? (选择题，B happiness)
- 知识点：理解形容词joyful与名词happiness的关系，以及它们在句中的用法。
4. I have a lovely doll called Mary. (选择题，B named)
- 知识点："called"或"named"后接名字，表示“被叫做”。
5. There are lots of fish in the lake. (选择题，D many)
- 知识点：形容词辨析，"fish"作为可数名词时，表示单个鱼用"a fish"，表示许多鱼用"many fish"。
6. Can’t you see the "s" on the corner of the schoolbag? (填空题，冠词B a; the)
- 知识点：不定冠词"a/an"用于泛指，定冠词"the"用于特指，这里特指书包的角落。
7. We couldn't finish our work so early without your help. (选择题，介词A without)
- 知识点：介词"without"表示“没有”，强调帮助的重要性。
8. She spends most of her spare time with her parents. (选择题，A spends)
- 知识点："spend time with sb."表示“花时间陪伴某人”。
9. I have great difficulty in finishing the work by myself. (选择题，D difficulty)
- 知识点："have difficulty in doing sth."表示“做某事有困难”。
10. Linder decided to go for a walk in the forest. (选择题，B to go)
- 知识点：动词不定式"to do"表示目的或计划，"decide to do sth."意为“决定去做某事”。
11. The earth is home to millions of animals. (选择题，D millions of)
- 知识点：数词与量词的搭配，表示不具体的大量时用"millions of"。
12. Mary is alone at home these days. / But she doesn’t feel lonely. (选择题，A alone; lonely)
- 知识点："alone"通常指客观上的独自一人，而"lonely"则指主观上的孤独感。
13. Mr Wang asks the students not to swim in the river. (选择题，C not to swim)
- 知识点：动词不定式的否定形式，"ask sb. not to do sth."意为“叫某人不要做某事”。
14. Yes, and I prefer tea with some sugar. (选择题，C with)
- 知识点："with"表示伴随，这里指加糖的茶。
15. We are raising money for charity. (选择题，C raising)
- 知识点："raise money"意为“筹款”，与慈善活动相关。
16. Tim used to love sports until he hurt his legs. (选择题，C love)
- 知识点："used to do sth."表示过去习惯性的动作或状态。
17. I’ll do what I can to help you. (选择题，B to help)
- 知识点：不定式"to do"表目的，"do what I can"后接不定式表示尽我所能去帮助你。
18. Because she is not strong enough for walking up mountains. (选择题，D for)
- 知识点："enough for doing sth."表示“足够做某事”。
以上是每道题目所涉及的英语语言点，这些知识点涵盖了词汇、语法、句型等多个方面，对于提升学生的英语基础能力非常有帮助。
