选择合适的介词填空完成句子。 1. Let's send an email _ (from, to) Mum. 2. Click _ (in, on) 'Send',please. 3. I've got a letter (from, of) my brother. 4. Dad is _ (to, at) work now. 5. We go to school (in, from) Monday _ (to, at) Saturday. 6. The message will go (in, to) Tom's computer.