We have to point out that the post ponement of the fulfilment of the contract（）caused us certain expenses. had。 have。 has。 having。
Everyone knows that China’s Bristles are of superior quality（）those from other countries. with。 to。 for。 than。
We shall do everything possible to assist you in（）a mutually beneficial trade. developing。 developed。 develop。 development。
We have noticed the Dutch producers（）a joint venture agreement with Chinese firms. interest。 are interested。 are interested in。 interest in。
We confirm（）your order No.7891 dated May 10，1990. A．to have received。 B．having received。 C．receiving。 D．toreceive。
We（）the seminar sponsored by you in September last year.
