choose the best answer from a、b or c according to the meaning of the sentence.
( )1. . when did hong kong return to our motherland?
________ july 1st ,1997.
a. on b. at c. in
( )2. she stayed at home , but she didn’t feel .
a. alone; lonelyb. lonely; alonec. alone; alone
( )3. let’s move the heavy bag, ________?
a. will you b. do you c. shall we ( )4. — will you come back, jack?
—in 3 weeks.
