( ) I often swim _______ weekends.
A. at B. in C. on
( ) Billy is too fat, he can’t _____of the door.
A.get out B. get up C. get to
( ) Peter often _____ an e-mail to his friend.
A.send B. sends C. give
( ) What _______ Mike _______ at weekends?
A. do;doB. is;do C. does;do
( ) Liu Tao is good at ________.
A. swim B. swims C. swimming