Hi Leute könntet Ihr mir die Antworten hierzu geben?

The company (1) signed/has signed a contract for a joint venture with a Chinese supplier last week. Although our current suppliers (2) had been/have been very reliable over the past three years, now they (3)were/are unable to meet all our demands. Mr Gonzalez, our new deputy CEO, (4) joined/has joined the company two months ago. He (5) has been/was previously Finance Director of ZEE Plastics, where he (6) has/had worked for 5 years. Currently he (7) leads/is leading the Chinese joint venture team. He (8) is speaking/speaks fluent Mandarin and (9) spent/had spent a year in China 3 years ago. While he (10) is/wasworking there he made some excellent contacts.