________ in his work, Tom simply forgot food and sleep.
| A．Absorbing | B．Absorb |
| C．Absorbed | D．To absorb |
30．---- Do you think it's a good idea to make friends with your students?
---- _____ , I do. I think it's a great idea.
| A．Really | B．Obviously | C．Actually | D．Generally |
29．---- I wonder how much you charge for your services.
---- The first two are free ____ the third costs $30.
| A．while | B．until | C．when | D．Before |
28．She’ll never forget her stay there ________ she found her son who had gone missing two years before.
| A．that | B．which | C．where | D．when |
27．My uncle’s house in the downtown area is much smaller than ours , but it is twice
_______ expensive .
| A．as | B．so | C．too | D．very |
26．Not until I came home last night ________ to bed.
| A．Mum did go | B．did Mum go | C．went Mum | D．Mum went |