Look at the trouble I am in. If only I _____ your advice.
| A．followed | B．would follow | C．had followed | D．should follow |
The fireman started to put out the big fire_____ arriving at the burning building.
| A．by | B．on | C．at | D．in |
The way you thought of _______ the experiment is very practical.
| A．carrying out | B．which to carry out |
| C．that carries out | D．to carry out |
Not only _____ our suggestions he _____ late together with us but he also started out alone at once.
| A．he refused, started | B．did he refuse, start |
| C．he did refuse, should start | D．refused he, should start |
The little boy is dirty from head to foot, because he _____in the mud all this morning.
| A．has played | B．is playing | C．has been playing | D．was playing |
In order to find out how the famous painting was stolen as soon as possible, more experienced policemen have been sent to _____ the case.
| A．look for | B．look up | C．look into | D．look through |