2. Mr.Black walked around and offered help () we were doing the experiment.
Aif
Bwhile
Cafter
Duntil
1. 单句改错,选出括号里的错误选项,并改正。The [A](main) character [B](of) the story [C](called) [D](Snow White) .
2. 单句改错,选出括号里的错误选项,并改正。Those poor [A](children) will [B](be happy). [C](only if) we [D](will help) them.
1. There are two sharks () the bridge.
2. By the end of last month he had swum () the Yellow River four times.
1. 假如你是李华,请根据以下写作要点向你的朋友Tom说明自己不能去参加他的生日宴会。 要点如下:1. 感谢邀请。 2. 道歉并说明不能去参加他的生日宴会。 3. 简要说明你不能参加的理由。 (1)奶奶卧病在床需要人照顾。 (2)父母出差去了香港下个月才能回来。 (3)为英语考试准备,须做听力练习。 4. 为不能参加Tom的生日聚会感到抱歉,并祝他生日快乐。 注意: 1.词数:60-80词;开头和结尾已给出,不计入总词数。 2.可以适当增加细节,以使行文连贯。 Dear Tom, Thank you very much for inviting me to your birthday party.( ) Best Wishes! Yours, Li Hua