. 单项选择。(15分)( )1. Lucy and Lily _ China next week.A. is visit B. are visiting C. visit D. visits( )2. How do you go to work?I usually go to work _.A. by a car B. in a car C. on a car D. by cars( )3. Must I finish my homework now?No, you _.A. may not B. mustnt C. cant D. neednt( )4. They each _ a CD in their bags.A. have B. has C. is D. are( )5. It is a good time _.A. sing B. to sing C. singing D. sang