Some researchers believe that there is no doubt ______ a cure for AIDS will be found.
| A．which | B．that | C．what | D．whether |
The priest made the ________ of the cross when he entered the church.
| A．mark | B．signal | C．sign | D．gesture |
On account of fuel supplies being finite and many people being wasteful, we will have to install ________ solar heating device in our home.
| A．some type of a | B．some types of a | C．some type of | D．some types of |
The system has been designed to give students quick and easy____. to the digital resources of the library.
| A．access | B．passage | C．way | D．approach |
We’ll be free tomorrow, so I suggest ____ to the history museum.
| A．to visit | B．visiting | C．we should visit | D．a visit |
The film brought the hours back to me ______ I was taken good care of in that far-away village.
| A．until | B．that | C．when | D．where |