_________basic first-aid techniques will help you respond quickly to emergencies.
| A．Known | B．Having known | C．Knowing | D．Being known |
People in the west makes ______ a rule to buy Christmas presents for their relatives and friends.
| A．that | B．it | C．this | D．The thing |
Will you see to ______ that the luggage is brought back?
| A．me | B．yourself | C．it | D．them |
I saw no more than one copy left in the bookshop. Will you go and buy ______?
| A．it | B．some | C．any | D．one |
Does _______ matter if he can’t finish the job on time?
| A．this | B．it | C．he | D．that |
I don’t think _______ possible to master a foreign language without much memory work.
| A．it | B．that | C．its | D．this |