–Would you like to go to the concert with me? –I’d love to, ______ I’m afraid I have no time.

______ we deal with our problems, we can easily become unhappy.

---I’ve heard some scientists have sent a spacecraft to Mars.
---Really? Has it arrived _____?
A already     B yet        C still            D ever

____ it’s difficult to make her dream come true, she never gives up.

       all of us enjoy playing computer games,         we can’t spend too much time on them.

We had so much homework. I didn’t go to bed         I finished it yesterday evening.

It has been five years ____ I came to this school.
for  B. since C. whether  D. when

     Jack had a fever,       he finishing doing his homework yesterday.  

I meant to help him . ______， he didn’t accept my offer.

Susan will not arrive at the airport on time _____she hurries up．
A．once          B．if                C．unless