Look at the trouble I am in. If only I _____ your advice.
| A．followed | B．would follow | C．had followed | D．should follow |
There are many insects in the world that never do _______ harm to human beings.
| A．less | B．the least | C．a little | D．the little |
_____ it is _____ you obtain, you should share _____ your parents your feelings.
| A．What, /, to | B．Whichever, that, with |
| C．Whatever, that, with | D．Which, /, to |
A greenhouse is a building _______ of glass _______ for keeping plants warm when the outside temperature is low..
| A．made, which is used | B．which is made, is used |
| C．made, being used | D．is made, used |
She is the only one of the persons ________ from the mistakes.
| A．whom I know have learned | B．whom I know has learned |
| C．I know who has learned | D．I know who have learned |
About _______ gene-targeting drugs are already in testing pipeline. It won’t be long ______ they are put into effect.
| A．two dozen; before | B．two dozens; that |
| C．two dozens of; before | D．dozens; that |