Xiao Li was about to cheat in the exam ________ the teacher came up, smiling to him.

        A. as     B. when     C. while     D. until

He has made some spelling mistakes in his composition; ___ they are not serious.

A. however         B. everywhere        C. therefore     D. since

________ she has made a decision, nothing can change it.

A. When                      B. Before                            C. As                          D. Once

He made a mistake, but he corrected the situation ________ it got worse.

A. before                      B. when                       C. until                       D. as

We’ll have to finish the work, ____.

A. no matter how long does it take              B. it takes however long

C. however long it takes                      D. however it takes long

It wasn’t until nearly a month later ____ I received the manager’s reply.

A. since                 B. when                C. as              D. that

We had to wait half an hour __________ we had already booked a table.

    A. since           B. although          C. until        D. before

They would be good friends _______ he saw her at the party.

A. for the first time   B. first time   C. the first time    D. it’s the first time

We won’t give up ___ we should fail 10 times.

  A. even if               B. since                     C. whether                 D. until

Physics is easy to learn ___ you understand the rules.

  A. since            B. unless                    C. though            D. once