小题1:Would you mind _______my (open) the door ?

小题2:He is______(interest) in history very much..

小题3: If he________(not work) tomorrow, he’ll have a picnic with us..

小题4:You’d better _________(ask) the policeman over there.

小题5:What ________ you _______(do) when the bell rang?

液压支架升架时，当顶梁与顶板接触后，操作手把还应在供液位置上保持一定时间，保证（）支。操作完毕后操作手把放置（）。