Помогите пожалуйста с 4 и 5 упр)) заранее спасибо даю 30 баллов

are testing have tested did you test...tested were testing have tested...are test...accept take part when did our engineers last take part in... will take part have taken part haven't taken part didn't take We expected that some of your engineers would start testing the new model immediately. If none of our inspectors find any defects in the machine's construction, we will take the first lot today. Will any of our engineers take part in testing the new equipment? We must tell the sellers that some of the engines sent by the contract 10 don't fit the standards. We' d like your inspectors to take the pre-test of the machine lot. Have you already cured the troubles that we discovered during testing?