Mr.Smith asked the boy a question________he could go to the concert with him.
| A．whether | B．that |
| C．what | D．if |
Always read the label ______ you wash your clothes．
| A．before | B．unless | C．since | D．until |
—Flight 331 _____．I'd better be on my way．Goodbye．
—Bye．Happy landing!
| A．is announced | B．is being announced |
| C．is announcing | D．has announced |
T appreciate that it's not easy for you, but you ______ try to get here on time．
| A．may | B．must | C．will | D．can |
—Sorry we're late．We ______ the wrong turning．
—That's all right．Come in, please．
| A．take | B．have taken | C．took | D．had taken |
You can try to guess the meaning of ______ words you don't know from ______ passage．
| A．the; 不填 | B．the; the | C．不填;不填 | D．不填; the |