We can hardly believe such a young boy ______ travel around the world all by himself.
| A．may | B．need | C．should | D．must |
28．___________a time in the 1960s when young people liked wearing army uniforms.
| A．It was | B．There was | C．It is | D．There is |
27．We tried hard，and eventually，we were able to get Mike______us his car just for a day．
| A．lending | B．lend | C．to lend | D．Lent |
26．—Why are your hands so dirty?
—I________in the garden．
| A．was working | B．have worked | C．worked | D．have been working |
25．—Why not open the windows to let_____cool air in?
—I'd rather you didn't_____air in our town is terribly polluted．
A．a；The B／；The C．/；/ D．the：/
24．It is a rule in our school that no books______out unless you have a library card.
| A．must be taken | B．might take | C．can be taken | D．should be taken |