阅读下面短文，按照句子结构的语法性和上下文连续的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空，并将答案填写在答题卷标号为的相应位置上。

Roadside bomb explosions in southern Afghanistan have killed at least five civilians and five policemen. The attack came as NATO’s new Secretary General visited Kabul     (discuss) with Afghan officials and candidates ahead of the August 20    (president) election.

Afghan officials in southern Helmans province said a group of civilians   (travel) to a wedding party when    big vehicle, which was being pulled by a tractor, hit a roadside bomb.

Officials have blamed Taliban insurgents（叛乱分子）as part of efforts to discourage voters   taking part in the coming election.

Five policemen were also killed in a separate roadside bomb burst in Helmand,  region is a known Taliban stronghold（据点）  thousands of US Marines and British soldiers are engaged  major anti-insurgency operations to improve security Afghans go to vote.

The security situation deteriorating（恶化）in southern parts of the country has been a cause of concern for both Afghan election officials and international observers since the (remove) of the Taliban from power in 2001.

He hadn’t seen his mother for a long time, so when he saw his mother he _____ crying.

A. burst out    B. burst into     C. burst in      D. burst on

When the girl learnt that her boy friend was ____ in the earthquake, she _____.

       A．injured; burst in tear                       B．killing; burst into tears

       C．still alive; burst into tears               D．missing; burst into laughter

On seeing Jay Chow appear on the stage, the audience _____ cheering.

A. burst on          B. burst into          C. burst in       D. burst out

 On seeing Jay Chow appear on the stage, the audience _____ cheering.

A. burst on          B. burst into          C. burst in       D. burst out