The train _____ at the present speed until it reaches the foot of the mountain at about nine o’clock tonight.
is known to us all isthe old scientist, for whom life was hard in the past, still works very hard in his eighties.
helicopter can take off and land straight up or down, and can also stay still inair.
--- Don’t leave water while you brush your teeth, honey. --- Ok, Mum.
--- Where did he leave his car key? --- It was in the lab he made the experiment.
--- Why don’t we take a little break? --- Didn’t we just have ?