四川省2013届高三英语二轮复习专题训练：单项选择（49）
从A、B、C 、D四个选项中，选出可以填入空白处的最佳选项。
1．Playing basketball is great fun; it also provides us with a chance to develop our sense of team spirit.
A．a;不填 B．不填;a C．a; the D．不填；不填
2．Scientists are convinced the positive effect of laughter physical and mental health.
A．of; at B．by; in C．of; on D．on; at
3．You can hardly imagine the difficulty the woman had her children.
A．brought up B．to bring up C．bringing up D．to have brought up
4．—Thank goodness, you are here! What you?
