

1. Please let Tim ......... with you A. go B. going C. to go D. goes
2. ............air is one of many problrms we have to solve A. pure B. polluted C. dust D. pleasant
3. Ba........... go to Balat in summer when he was young A. use to B. used to C. is used to D.is used
2. ............air is one of many problrms we have to solve A. pure B. polluted C. dust D. pleasant
3. Ba........... go to Balat in summer when he was young A. use to B. used to C. is used to D.is used