When ______ comes to research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.
| A．it | B．this | C．that | D．which |
Mrs Green wants to buy that kind of cloth because she ____ that the cloth ____very well .
| A．has been told ; washes | B．is told ; is washed |
| C．has been told ; is washed | D．is told ; is washed |
---When ______ and visit our exhibition next month ?
-- -When _______ , I will let you know .
| A．will he come ; he will come | B．will he come ; he comes |
| C．does he come ; he will come | D．does he come ; he comes |
Michael ______ here to see you and he ______ a note on your desk .
| A．has come ; has left | B．has been ; has left | C．has come ; left | D．has been ; left |
---How long _______ each other before they ________ married ?
---For about a year .
| A．have they known ; get | B．did they know ; were going to get |
| C．do they know ; are going to get | D．had they known ; got |
I really wonder ______ he has posted me many parcels _____ we worked together .
| A．how ; after | B．why ; when | C．when ; before | D．why ; since |