No one will be sad because humans will have learnt to fix many of the problems that affect us now, like war, pollution and hunger, ________ ?

I thought she was an honest girl ________I saw her.[ ]

We give dogs time, space and love we can spare, and ________, dogs give us their all[ ]

In my school, English is compulsory (必修) for all students, but French and Spanish are ___.

They have leading experts in this field，and that’s __________ they’ve made important progress