Pleasebeserious.Iamnot_______.Youshouldconsideritcarefully
A、sortingManykindsofanimalsarebelievedtohave_________fromtheearth
Whenaspacecrafttravels,oneofthemajorproblemsisreentryintotheEarth’s_______.
If you have any problems during your study here,please do not _______ to call me for help
John _______ to be a polite man. But in fact he is veryrude.
I have not heard anything from him since his _______.
