1.There was a teapot made like a duck,------ open mouth the

1。 B
完整的定语从句为：
whose open mouth the tea was supposed to come through
=the tea was supposed to come through whose open mouth
=the tea was supposed to come through the teapot's open mouth
固定搭配：be supposed to do sth
如果用its则两个并列句之间缺少and/so等连词连接
2。 C
主语从句____ the workers insisted on中on缺少宾语,所以用what(that在从句中不能充当任何成分)；
表语从句应该用虚拟语气,故其谓语构成：(should) + 动词原形,should一般会省略；
根据句意表语从句为被动语态。
3。 C
by the end则句子会用完成时；
as he could doing experiments=as he could (spent much time) (in) doing experiments,其实是固定短语spend some time (in) doing sth
The young man spent as much time as he______experiments。
4。 D
逗号后为独立主格结构,所以必须有自己独立的主语即its top。
its top well above the others
=its top being well above the others
5。 C
此题最好还原成陈述句,则可以看出是个would rather do sth结构；而此题的do sth为have sb do sth“使得某人做某事”短语；
此句问的是使役动词have的宾语,所以用me对应whom
6。 A
后句的句型“it be some time since从句”中的be一般是一般现在时/现在完成时,且since从句中的时态一般是一般过去时；当然be也可以是一般过去时,则since从句中的时态对应是过去完成时；
另：根据since从句中谓语动词的延续与否,句子翻译不一：
It is two months since he was a college student。翻译为：自从他不是个大学生以来已经两个月了；
It is two months since he became a college student。则翻译为：自从他成为个大学生以来已经两个月了。
7。 C
固定句型：sb be at/on the point of doing sth when从句,翻译为“某人正要做某事,就在这时。。。”；
此句型亦可为：sb be about to do sth when从句
8。 A
look good 看起来好看,look well 看起来气色不错/健康；
sth look nice on sb=sb look nice in sth 某人穿某物看起来好看
9。 A
用个名词性短语来回答疑问词whom；
A the man you call Mr。 Li。=the man whom you call Mr。 Li。用定语从句修饰the man；
B应该是calling himself,因为既然是自称,则the man和call之间是主动关系；
C少了himeself,或把calling改成called(被别人称为Mr。 Lin,则是被动)；
D多了is,不能用个陈述句来回答此问题,否则牛头不对马嘴。
10。 D
require后面的宾语从句要求用虚拟语气,即从句谓语动词由“(should) + 动词原形”构成,should可以省略；
whoever did it be careful and brave enough=anybody (who did it) should be careful and brave enough,打括号者为定语从句,便于楼主理解。