The building around the comer caught fire last night. The police are now _____the matter.
| A．geeing through | B．working out | C．looking into | D．watching over |
I smell something ____ in the kitchen. Can I call you back in a minute?
| A．burning | B．burnt | C．being burnt | D．to be burnt |
——Let’s go to the movies after supper. OK?
——_______________.
| A．Not at all | B．Why not? | C．Never mind | D．Go ahead |
Mary came in , _____ by her dog.
| A．following | B．to follow | C．followed | D．to be followed |
I failed in the final exam last term and only then ______ the importance of studies.
| A．I realized | B．I had realized | C．had I realized | D．did I realize |
I hated practicing, but I stuck_______ _it and now I can play pretty well.
| A．to do | B．to doing | C．do | D．doing |