我市今年财政收入已突破400亿大关，用科学记数法可记作______．
400亿=400 0000 0000=4×1010，
故答案为：4×1010．
根据民事担保理论，我国《担保法》所规定的定金性质上届于( )。
A．成约定金
B．证约定金
C．解约定金
D．预付款
An important meeting will be held in the school hall. Everyone _____there on time.
A．expects to be
B．is supposed to be
C．looks forward to be
D．is hoped to
