【推荐1】Exploring outer space is a challenge ______ mankind.

【推荐2】He had a very bad attitude ________work, which resulted in his losing the job. （用适当的词填空）

【推荐3】Students must have access________ good resources. （用适当的词填空）

【推荐2】He is a shy person. He finds it difficult to speak to the ones ______ the opposite sex.

【推荐3】单句语法填空
1. I wonder if they have been rescued__________the burning house by the firefighters.
2. Being shy, she isn't used to___________(praise) in front of others.
3. He sincerely apologized___________her___________ losing his temper yesterday.
4. Jack is late again. It is typical____________ him to keep others waiting.
5. It's very easy for teenagers to become attached___________online games, which is really harmful to them.
6. An increasing number of high school graduates have difficulty in expressing themselves (adequate) in writing,________ either in Chinese or in English.
7. -Jimmy is still unhappy today-It's all your fault. You should have made an________(apologise)to him yesterday.
8. _______(commit)to improving the quality of services, we will provide customers with all the information they need.