. All the girls swam in the lake except two， who _____ halfway.
| A．gave off | B．gave up | C．gave away | D．gave out |
Is this the reason ______he explained at the meeting for his carelessness in his work?
| A．that | B．what | C．how | D．why |
The young mother mw her baby fall to the ground, ______ brought her heart to her mouth．
| A．it | B．and that | C．and which | D．that |
He has three brothers, ________ is a doctor．
| A．all of them | B．all of whom | C．none of whom | D．both of them |
He never reads anything _______ is not worth reading．
| A．as | B．which | C．who | D．that |
―When was the house built?
―It was built in 1949 _______ the PRC was founded．
| A．which | B．that | C．what | D．when |