10/ Scientists have spent years . ………………..information about UFOs. ( collect )
11/ This product is commercially acceptable, but ……………….. inacceptable. ( educate )
12/ The evening was ……………… spent talking and dancing. ( enjoy )
13/ Vo Thi Sau and Nguyen Thi Minh Khai are ……………….. who are much loved and respected by their people for their courage and great qualities. ( hero )
14/ Please stand at the ………………… to the museum. I’ll be there in 5 minutes. ( enter )
15/ We ………………. go out for dinner but we cook our meal most of the time. ( occasion )
16/ Peter’s opinion wasn’t practical so we were in ………………. with him. ( agree )
17/ My father has a large ………………. of coins. ( collect )
18/ Mary had no ………………… getting up early in the morning. ( difficult )
19/ He tried to make his speech more ………………… ( entertain )
20/ This athlete has had …………………... achievements. ( admire )