He tried his best to solve the problem，________difficult it was.
| A．however | B．no matter |
| C．whatever | D．although |
It’s hard for a woman to run after fashion as it _______ so quickly.
| A．has changed | B．has been changing | C．was changed | D．is changed |
The twin brothers are very similar ______ appearance but quite different _____ hobbies.
| A．to , in | B．to ,from | C．in ,in | D．in, from |
Children experts suggest children ______ more time to play freely.
| A．are given | B．will be given | C．be given | D．must be given |
-- It is fairly warm today.
-- So _____ and so _______ yesterday.
| A．it is, was it | B．it is, it was | C．is it, was it | D．is it, it was |
Tom needn’t ask you the time now as he has had his watch _______ .
| A．repair | B．being repaired | C．repaired | D．to be repaired |