The methods of communication used during the war were (primitive).

The contract between the two companies will (expire) so...

单项选择题The contract between the two companies will (expire) soon.

This species has nearly (died out) because its habitat ...

单项选择题This species has nearly (died out) because its habitat is being destroyed.

The rules are too (rigid) to allow for human error.A．in...

单项选择题The rules are too (rigid) to allow for human error.