用sometimes，sometime，some times或some time完成下面的句子

1.-Will you stay in Beijing for __________?  

    -Yes, I will.

2. __________ he goes to school by bike and __________ by bus.

3. The museum was built __________ before 1258.

4. After __________, Mr Liu came back from abroad.

5. He has been told not to play computer games too much __________.

冲积物的显著特点是磨圆度好、分选性强、具有明显的（）。