question: thoracic radiography and echocardiography may be useful in assessing the severity of myocardial disease, and chest x-rays can be used to detect pulmonary metastasis.
Capitalize this past sentence correctly.
A: Thoracic radiography and echocardiography may be useful in assessing the severity of myocardial disease, and chest X-rays can be used to detect pulmonary metastasis.

question: if this process is successful, then a new zip file is created in the directory alongside the corrupt zip file with the same name you have named for zip file with the suffix "fixed" at the end.
Capitalize this past sentence correctly.
A: If this process is successful, then a new ZIP file is created in the directory alongside the corrupt zip file with the same name you have named for ZIP file with the suffix "FIXED" at the end.

question: after widely overcast, but mainly dry weather in the morning variable clouds with rain showers will dominate for a time.
Capitalize this past sentence correctly.
A: After widely overcast, but mainly dry weather in the morning variable clouds with rain showers will dominate for a time.