______ for some time after a tiring day is very enjoyable and exciting for me in summer.
A Swim B Swimming C Go swimming D To swim
center
| A．ocean | B．decide | C．cause | D．socialist |
ground
| A．house | B．country | C．group | D．cough |
breathe
| A．thick | B．southern | C．mathematics | D．method |
stop
| A．lose | B．woman | C．shock | D．rose |
So lost in their computers____that leaders at summer computer camps often have to force them to break for sports and games.
| A．became the children | B．become the children |
| C．had the children become | D．do the children become |