The top student failed again in the examination and only then ______ the importance of reading and memorizing the English texts.
| A．he realized | B．he had realized | C．had he realized | D．did he realize |
As time _____, she became more and more anxious about her son’s safety.
| A．passing | B．going by | C．goes by | D．passed |
--- It was not until she had arrived home _________ her appointment with the doctor.
| A．when she remembered | B．that she remembered |
C．did she remember |
D．and she remembered |
The father as well as his three children________ skating on the frozen river every Sunday afternoon.
| A．is going | B．go | C．goes | D．are going |
My sister______ the League last month and she has decided to ______ the activity to help the aged next week.
| A．joined; join in | B．took part in; join | C．joined; attend | D．joined in; join in |
Eric received training in computer for one year, _______ he found a job in a big company.
| A．after that | B．after it | C．after which | D．after this |